Revert "Reland "Make GrVkBackendContext no longer derive from SkRefCnt.""

This reverts commit 0db3a8846a4d05d55c36b7fa95fa6fbc1a6639cd.

Reason for revert: fuchsia change reverted

Original change's description:
> Reland "Make GrVkBackendContext no longer derive from SkRefCnt."
> 
> This reverts commit 059a9ab4bcd07a4bfdbfef333c27ef3d277e0e46.
> 
> Reason for revert: Fix landed in Fuchsia
> 
> Original change's description:
> > Revert "Make GrVkBackendContext no longer derive from SkRefCnt."
> > 
> > This reverts commit 93ae2337732bf206e6ef4faecc6b30c3881e8359.
> > 
> > Reason for revert: <INSERT REASONING HERE>
> > 
> > Original change's description:
> > > Make GrVkBackendContext no longer derive from SkRefCnt.
> > > 
> > > Also moves the helper Create functions to VkTestUtils since no clients
> > > are using them anymore.
> > > 
> > > Bug: skia:
> > > Change-Id: I7e8e4912e7ef6fb00a7e2a00407aed5e83211799
> > > Reviewed-on: https://skia-review.googlesource.com/135323
> > > Reviewed-by: Jim Van Verth <jvanverth@google.com>
> > > Reviewed-by: Brian Salomon <bsalomon@google.com>
> > > Commit-Queue: Greg Daniel <egdaniel@google.com>
> > 
> > TBR=egdaniel@google.com,jvanverth@google.com,bsalomon@google.com
> > 
> > # Not skipping CQ checks because original CL landed > 1 day ago.
> > 
> > Bug: skia:
> > Change-Id: If7201917631dc22753ea3fa6e9d2984463e38e4c
> > Reviewed-on: https://skia-review.googlesource.com/137903
> > Reviewed-by: Greg Daniel <egdaniel@google.com>
> > Commit-Queue: Greg Daniel <egdaniel@google.com>
> 
> TBR=egdaniel@google.com,jvanverth@google.com,bsalomon@google.com
> 
> # Not skipping CQ checks because original CL landed > 1 day ago.
> 
> Bug: skia:
> Change-Id: Ia4b7c0bb2c7b5dba809d85c69f0b41b473140526
> Reviewed-on: https://skia-review.googlesource.com/138181
> Reviewed-by: Greg Daniel <egdaniel@google.com>
> Commit-Queue: Greg Daniel <egdaniel@google.com>

TBR=egdaniel@google.com,jvanverth@google.com,bsalomon@google.com

Change-Id: I3f7bc4a5e4e09512fe165303685c123ec3527e58
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: skia:
Reviewed-on: https://skia-review.googlesource.com/138422
Reviewed-by: Greg Daniel <egdaniel@google.com>
Commit-Queue: Greg Daniel <egdaniel@google.com>

6 files changed, 107 insertions, 480 deletions

diff --git a/tools/gpu/vk/VkTestContext.cpp b/tools/gpu/vk/VkTestContext.cpp
index 592fb0f7b0..25069fe521 100644
--- a/tools/gpu/vk/VkTestContext.cpp
+++ b/tools/gpu/vk/VkTestContext.cpp
@@ -110,24 +110,21 @@ GR_STATIC_ASSERT(sizeof(VkFence) <= sizeof(sk_gpu_test::PlatformFence));
 class VkTestContextImpl : public sk_gpu_test::VkTestContext {
 public:
     static VkTestContext* Create(VkTestContext* sharedContext) {
-        GrVkBackendContext backendContext;
-        bool ownsContext = true;
+        sk_sp<const GrVkBackendContext> backendContext;
         if (sharedContext) {
             backendContext = sharedContext->getVkBackendContext();
-            // We always delete the parent context last so make sure the child does not think they
-            // own the vulkan context.
-            ownsContext = false;
         } else {
             PFN_vkGetInstanceProcAddr instProc;
             PFN_vkGetDeviceProcAddr devProc;
             if (!sk_gpu_test::LoadVkLibraryAndGetProcAddrFuncs(&instProc, &devProc)) {
                 return nullptr;
             }
-            if (!sk_gpu_test::CreateVkBackendContext(instProc, devProc, &backendContext)) {
-                return nullptr;
-            }
+            backendContext.reset(GrVkBackendContext::Create(instProc, devProc));
         }
-        return new VkTestContextImpl(backendContext, ownsContext);
+        if (!backendContext) {
+            return nullptr;
+        }
+        return new VkTestContextImpl(std::move(backendContext));
     }
 
     ~VkTestContextImpl() override { this->teardown(); }
@@ -146,19 +143,14 @@ public:
 protected:
     void teardown() override {
         INHERITED::teardown();
-        fVk.fMemoryAllocator.reset();
-        if (fOwnsContext) {
-            GR_VK_CALL(this->vk(), DeviceWaitIdle(fVk.fDevice));
-            GR_VK_CALL(this->vk(), DestroyDevice(fVk.fDevice, nullptr));
-            GR_VK_CALL(this->vk(), DestroyInstance(fVk.fInstance, nullptr));
-        }
+        fVk.reset(nullptr);
     }
 
 private:
-    VkTestContextImpl(const GrVkBackendContext& backendContext, bool ownsContext)
-            : VkTestContext(backendContext, ownsContext) {
-        fFenceSync.reset(new VkFenceSync(fVk.fInterface, fVk.fDevice, fVk.fQueue,
-                                         fVk.fGraphicsQueueIndex));
+    VkTestContextImpl(sk_sp<const GrVkBackendContext> backendContext)
+            : VkTestContext(std::move(backendContext)) {
+        fFenceSync.reset(new VkFenceSync(fVk->fInterface, fVk->fDevice, fVk->fQueue,
+                                         fVk->fGraphicsQueueIndex));
     }
 
     void onPlatformMakeCurrent() const override {}
diff --git a/tools/gpu/vk/VkTestContext.h b/tools/gpu/vk/VkTestContext.h
index 0e62cc0b8c..9fd4170d9d 100644
--- a/tools/gpu/vk/VkTestContext.h
+++ b/tools/gpu/vk/VkTestContext.h
@@ -19,18 +19,16 @@ class VkTestContext : public TestContext {
 public:
     virtual GrBackend backend() override { return kVulkan_GrBackend; }
 
-    const GrVkBackendContext& getVkBackendContext() {
+    sk_sp<const GrVkBackendContext> getVkBackendContext() {
         return fVk;
     }
 
-    const GrVkInterface* vk() const { return fVk.fInterface.get(); }
+    const GrVkInterface* vk() const { return fVk->fInterface.get(); }
 
 protected:
-    VkTestContext(const GrVkBackendContext& vk, bool ownsContext)
-            : fVk(vk), fOwnsContext(ownsContext) {}
+    VkTestContext(sk_sp<const GrVkBackendContext> vk) : fVk(std::move(vk)) {}
 
-    GrVkBackendContext fVk;
-    bool fOwnsContext;
+    sk_sp<const GrVkBackendContext> fVk;
 
 private:
     typedef TestContext INHERITED;
diff --git a/tools/gpu/vk/VkTestUtils.cpp b/tools/gpu/vk/VkTestUtils.cpp
index 927f4fbe82..c28a42b2c9 100644
--- a/tools/gpu/vk/VkTestUtils.cpp
+++ b/tools/gpu/vk/VkTestUtils.cpp
@@ -9,9 +9,6 @@
 
 #ifdef SK_VULKAN
 
-#include "SkAutoMalloc.h"
-#include "vk/GrVkBackendContext.h"
-#include "vk/GrVkExtensions.h"
 #include "../ports/SkOSLibrary.h"
 
 namespace sk_gpu_test {
@@ -49,323 +46,6 @@ bool LoadVkLibraryAndGetProcAddrFuncs(PFN_vkGetInstanceProcAddr* instProc,
     return true;
 #endif
 }
-
-////////////////////////////////////////////////////////////////////////////////
-// Helper code to set up Vulkan context objects
-
-#ifdef SK_ENABLE_VK_LAYERS
-const char* kDebugLayerNames[] = {
-    // elements of VK_LAYER_LUNARG_standard_validation
-    "VK_LAYER_GOOGLE_threading",
-    "VK_LAYER_LUNARG_parameter_validation",
-    "VK_LAYER_LUNARG_object_tracker",
-    "VK_LAYER_LUNARG_image",
-    "VK_LAYER_LUNARG_core_validation",
-    "VK_LAYER_LUNARG_swapchain",
-    "VK_LAYER_GOOGLE_unique_objects",
-    // not included in standard_validation
-    //"VK_LAYER_LUNARG_api_dump",
-    //"VK_LAYER_LUNARG_vktrace",
-    //"VK_LAYER_LUNARG_screenshot",
-};
-#endif
-
-// the minimum version of Vulkan supported
-#ifdef SK_BUILD_FOR_ANDROID
-const uint32_t kGrVkMinimumVersion = VK_MAKE_VERSION(1, 0, 3);
-#else
-const uint32_t kGrVkMinimumVersion = VK_MAKE_VERSION(1, 0, 8);
-#endif
-
-#define ACQUIRE_VK_PROC(name, instance, device)                                \
-    PFN_vk##name grVk##name =                                                  \
-        reinterpret_cast<PFN_vk##name>(getProc("vk" #name, instance, device)); \
-    if (grVk##name == nullptr) {                                               \
-        SkDebugf("Function ptr for vk%s could not be acquired\n", #name);      \
-        return false;                                                          \
-    }
-
-bool CreateVkBackendContext(const GrVkInterface::GetInstanceProc& getInstanceProc,
-                            const GrVkInterface::GetDeviceProc& getDeviceProc,
-                            GrVkBackendContext* ctx,
-                            uint32_t* presentQueueIndexPtr,
-                            CanPresentFn canPresent) {
-    auto getProc = [&getInstanceProc, &getDeviceProc](const char* proc_name,
-                                                      VkInstance instance, VkDevice device) {
-        if (device != VK_NULL_HANDLE) {
-            return getDeviceProc(device, proc_name);
-        }
-        return getInstanceProc(instance, proc_name);
-    };
-
-    VkPhysicalDevice physDev;
-    VkDevice device;
-    VkInstance inst;
-    VkResult err;
-
-    const VkApplicationInfo app_info = {
-        VK_STRUCTURE_TYPE_APPLICATION_INFO, // sType
-        nullptr,                            // pNext
-        "vktest",                           // pApplicationName
-        0,                                  // applicationVersion
-        "vktest",                           // pEngineName
-        0,                                  // engineVerison
-        kGrVkMinimumVersion,                // apiVersion
-    };
-
-    GrVkExtensions extensions(getProc);
-    extensions.initInstance(kGrVkMinimumVersion);
-
-    SkTArray<const char*> instanceLayerNames;
-    SkTArray<const char*> instanceExtensionNames;
-    uint32_t extensionFlags = 0;
-#ifdef SK_ENABLE_VK_LAYERS
-    for (size_t i = 0; i < SK_ARRAY_COUNT(kDebugLayerNames); ++i) {
-        if (extensions.hasInstanceLayer(kDebugLayerNames[i])) {
-            instanceLayerNames.push_back(kDebugLayerNames[i]);
-        }
-    }
-    if (extensions.hasInstanceExtension(VK_EXT_DEBUG_REPORT_EXTENSION_NAME)) {
-        instanceExtensionNames.push_back(VK_EXT_DEBUG_REPORT_EXTENSION_NAME);
-        extensionFlags |= kEXT_debug_report_GrVkExtensionFlag;
-    }
-#endif
-
-    if (extensions.hasInstanceExtension(VK_KHR_SURFACE_EXTENSION_NAME)) {
-        instanceExtensionNames.push_back(VK_KHR_SURFACE_EXTENSION_NAME);
-        extensionFlags |= kKHR_surface_GrVkExtensionFlag;
-    }
-    if (extensions.hasInstanceExtension(VK_KHR_SWAPCHAIN_EXTENSION_NAME)) {
-        instanceExtensionNames.push_back(VK_KHR_SWAPCHAIN_EXTENSION_NAME);
-        extensionFlags |= kKHR_swapchain_GrVkExtensionFlag;
-    }
-#ifdef SK_BUILD_FOR_WIN
-    if (extensions.hasInstanceExtension(VK_KHR_WIN32_SURFACE_EXTENSION_NAME)) {
-        instanceExtensionNames.push_back(VK_KHR_WIN32_SURFACE_EXTENSION_NAME);
-        extensionFlags |= kKHR_win32_surface_GrVkExtensionFlag;
-    }
-#elif defined(SK_BUILD_FOR_ANDROID)
-    if (extensions.hasInstanceExtension(VK_KHR_ANDROID_SURFACE_EXTENSION_NAME)) {
-        instanceExtensionNames.push_back(VK_KHR_ANDROID_SURFACE_EXTENSION_NAME);
-        extensionFlags |= kKHR_android_surface_GrVkExtensionFlag;
-    }
-#elif defined(SK_BUILD_FOR_UNIX) && !defined(__Fuchsia__)
-    if (extensions.hasInstanceExtension(VK_KHR_XCB_SURFACE_EXTENSION_NAME)) {
-        instanceExtensionNames.push_back(VK_KHR_XCB_SURFACE_EXTENSION_NAME);
-        extensionFlags |= kKHR_xcb_surface_GrVkExtensionFlag;
-    }
-#endif
-
-    const VkInstanceCreateInfo instance_create = {
-        VK_STRUCTURE_TYPE_INSTANCE_CREATE_INFO,    // sType
-        nullptr,                                   // pNext
-        0,                                         // flags
-        &app_info,                                 // pApplicationInfo
-        (uint32_t) instanceLayerNames.count(),     // enabledLayerNameCount
-        instanceLayerNames.begin(),                // ppEnabledLayerNames
-        (uint32_t) instanceExtensionNames.count(), // enabledExtensionNameCount
-        instanceExtensionNames.begin(),            // ppEnabledExtensionNames
-    };
-
-    ACQUIRE_VK_PROC(CreateInstance, VK_NULL_HANDLE, VK_NULL_HANDLE);
-    err = grVkCreateInstance(&instance_create, nullptr, &inst);
-    if (err < 0) {
-        SkDebugf("vkCreateInstance failed: %d\n", err);
-        return false;
-    }
-
-    ACQUIRE_VK_PROC(DestroyInstance, inst, VK_NULL_HANDLE);
-    ACQUIRE_VK_PROC(EnumeratePhysicalDevices, inst, VK_NULL_HANDLE);
-    ACQUIRE_VK_PROC(GetPhysicalDeviceQueueFamilyProperties, inst, VK_NULL_HANDLE);
-    ACQUIRE_VK_PROC(GetPhysicalDeviceFeatures, inst, VK_NULL_HANDLE);
-    ACQUIRE_VK_PROC(CreateDevice, inst, VK_NULL_HANDLE);
-    ACQUIRE_VK_PROC(GetDeviceQueue, inst, VK_NULL_HANDLE);
-    ACQUIRE_VK_PROC(DeviceWaitIdle, inst, VK_NULL_HANDLE);
-    ACQUIRE_VK_PROC(DestroyDevice, inst, VK_NULL_HANDLE);
-
-    uint32_t gpuCount;
-    err = grVkEnumeratePhysicalDevices(inst, &gpuCount, nullptr);
-    if (err) {
-        SkDebugf("vkEnumeratePhysicalDevices failed: %d\n", err);
-        grVkDestroyInstance(inst, nullptr);
-        return false;
-    }
-    if (!gpuCount) {
-        SkDebugf("vkEnumeratePhysicalDevices returned no supported devices.\n");
-        grVkDestroyInstance(inst, nullptr);
-        return false;
-    }
-    // Just returning the first physical device instead of getting the whole array.
-    // TODO: find best match for our needs
-    gpuCount = 1;
-    err = grVkEnumeratePhysicalDevices(inst, &gpuCount, &physDev);
-    // VK_INCOMPLETE is returned when the count we provide is less than the total device count.
-    if (err && VK_INCOMPLETE != err) {
-        SkDebugf("vkEnumeratePhysicalDevices failed: %d\n", err);
-        grVkDestroyInstance(inst, nullptr);
-        return false;
-    }
-
-    // query to get the initial queue props size
-    uint32_t queueCount;
-    grVkGetPhysicalDeviceQueueFamilyProperties(physDev, &queueCount, nullptr);
-    if (!queueCount) {
-        SkDebugf("vkGetPhysicalDeviceQueueFamilyProperties returned no queues.\n");
-        grVkDestroyInstance(inst, nullptr);
-        return false;
-    }
-
-    SkAutoMalloc queuePropsAlloc(queueCount * sizeof(VkQueueFamilyProperties));
-    // now get the actual queue props
-    VkQueueFamilyProperties* queueProps = (VkQueueFamilyProperties*)queuePropsAlloc.get();
-
-    grVkGetPhysicalDeviceQueueFamilyProperties(physDev, &queueCount, queueProps);
-
-    // iterate to find the graphics queue
-    uint32_t graphicsQueueIndex = queueCount;
-    for (uint32_t i = 0; i < queueCount; i++) {
-        if (queueProps[i].queueFlags & VK_QUEUE_GRAPHICS_BIT) {
-            graphicsQueueIndex = i;
-            break;
-        }
-    }
-    if (graphicsQueueIndex == queueCount) {
-        SkDebugf("Could not find any supported graphics queues.\n");
-        grVkDestroyInstance(inst, nullptr);
-        return false;
-    }
-
-    // iterate to find the present queue, if needed
-    uint32_t presentQueueIndex = queueCount;
-    if (presentQueueIndexPtr && canPresent) {
-        for (uint32_t i = 0; i < queueCount; i++) {
-            if (canPresent(inst, physDev, i)) {
-                presentQueueIndex = i;
-                break;
-            }
-        }
-        if (presentQueueIndex == queueCount) {
-            SkDebugf("Could not find any supported present queues.\n");
-            grVkDestroyInstance(inst, nullptr);
-            return false;
-        }
-        *presentQueueIndexPtr = presentQueueIndex;
-    } else {
-        // Just setting this so we end up make a single queue for graphics since there was no
-        // request for a present queue.
-        presentQueueIndex = graphicsQueueIndex;
-    }
-
-    extensions.initDevice(kGrVkMinimumVersion, inst, physDev);
-
-    SkTArray<const char*> deviceLayerNames;
-    SkTArray<const char*> deviceExtensionNames;
-#ifdef SK_ENABLE_VK_LAYERS
-    for (size_t i = 0; i < SK_ARRAY_COUNT(kDebugLayerNames); ++i) {
-        if (extensions.hasDeviceLayer(kDebugLayerNames[i])) {
-            deviceLayerNames.push_back(kDebugLayerNames[i]);
-        }
-    }
-#endif
-    if (extensions.hasDeviceExtension(VK_KHR_SWAPCHAIN_EXTENSION_NAME)) {
-        deviceExtensionNames.push_back(VK_KHR_SWAPCHAIN_EXTENSION_NAME);
-        extensionFlags |= kKHR_swapchain_GrVkExtensionFlag;
-    }
-    if (extensions.hasDeviceExtension("VK_NV_glsl_shader")) {
-        deviceExtensionNames.push_back("VK_NV_glsl_shader");
-        extensionFlags |= kNV_glsl_shader_GrVkExtensionFlag;
-    }
-
-    // query to get the physical device properties
-    VkPhysicalDeviceFeatures deviceFeatures;
-    grVkGetPhysicalDeviceFeatures(physDev, &deviceFeatures);
-    // this looks like it would slow things down,
-    // and we can't depend on it on all platforms
-    deviceFeatures.robustBufferAccess = VK_FALSE;
-
-    uint32_t featureFlags = 0;
-    if (deviceFeatures.geometryShader) {
-        featureFlags |= kGeometryShader_GrVkFeatureFlag;
-    }
-    if (deviceFeatures.dualSrcBlend) {
-        featureFlags |= kDualSrcBlend_GrVkFeatureFlag;
-    }
-    if (deviceFeatures.sampleRateShading) {
-        featureFlags |= kSampleRateShading_GrVkFeatureFlag;
-    }
-
-    float queuePriorities[1] = { 0.0 };
-    // Here we assume no need for swapchain queue
-    // If one is needed, the client will need its own setup code
-    const VkDeviceQueueCreateInfo queueInfo[2] = {
-        {
-            VK_STRUCTURE_TYPE_DEVICE_QUEUE_CREATE_INFO, // sType
-            nullptr,                                    // pNext
-            0,                                          // VkDeviceQueueCreateFlags
-            graphicsQueueIndex,                         // queueFamilyIndex
-            1,                                          // queueCount
-            queuePriorities,                            // pQueuePriorities
-        },
-        {
-            VK_STRUCTURE_TYPE_DEVICE_QUEUE_CREATE_INFO, // sType
-            nullptr,                                    // pNext
-            0,                                          // VkDeviceQueueCreateFlags
-            presentQueueIndex,                          // queueFamilyIndex
-            1,                                          // queueCount
-            queuePriorities,                            // pQueuePriorities
-        }
-    };
-    uint32_t queueInfoCount = (presentQueueIndex != graphicsQueueIndex) ? 2 : 1;
-
-    const VkDeviceCreateInfo deviceInfo = {
-        VK_STRUCTURE_TYPE_DEVICE_CREATE_INFO,    // sType
-        nullptr,                                 // pNext
-        0,                                       // VkDeviceCreateFlags
-        queueInfoCount,                          // queueCreateInfoCount
-        queueInfo,                               // pQueueCreateInfos
-        (uint32_t) deviceLayerNames.count(),     // layerCount
-        deviceLayerNames.begin(),                // ppEnabledLayerNames
-        (uint32_t) deviceExtensionNames.count(), // extensionCount
-        deviceExtensionNames.begin(),            // ppEnabledExtensionNames
-        &deviceFeatures                          // ppEnabledFeatures
-    };
-
-    err = grVkCreateDevice(physDev, &deviceInfo, nullptr, &device);
-    if (err) {
-        SkDebugf("CreateDevice failed: %d\n", err);
-        grVkDestroyInstance(inst, nullptr);
-        return false;
-    }
-
-    auto interface =
-        sk_make_sp<GrVkInterface>(getProc, inst, device, extensionFlags);
-    if (!interface->validate(extensionFlags)) {
-        SkDebugf("Vulkan interface validation failed\n");
-        grVkDeviceWaitIdle(device);
-        grVkDestroyDevice(device, nullptr);
-        grVkDestroyInstance(inst, nullptr);
-        return false;
-    }
-
-    VkQueue queue;
-    grVkGetDeviceQueue(device, graphicsQueueIndex, 0, &queue);
-
-    ctx->fInstance = inst;
-    ctx->fPhysicalDevice = physDev;
-    ctx->fDevice = device;
-    ctx->fQueue = queue;
-    ctx->fGraphicsQueueIndex = graphicsQueueIndex;
-    ctx->fMinAPIVersion = kGrVkMinimumVersion;
-    ctx->fExtensions = extensionFlags;
-    ctx->fFeatures = featureFlags;
-    ctx->fInterface.reset(interface.release());
-    ctx->fOwnsInstanceAndDevice = false;
-
-    return true;
-
-
-}
-
 }
 
 #endif
diff --git a/tools/gpu/vk/VkTestUtils.h b/tools/gpu/vk/VkTestUtils.h
index 30471a78c0..9f34ef09c5 100644
--- a/tools/gpu/vk/VkTestUtils.h
+++ b/tools/gpu/vk/VkTestUtils.h
@@ -13,21 +13,9 @@
 #ifdef SK_VULKAN
 
 #include "vk/GrVkDefines.h"
-#include "vk/GrVkInterface.h"
-
-struct GrVkBackendContext;
 
 namespace sk_gpu_test {
     bool LoadVkLibraryAndGetProcAddrFuncs(PFN_vkGetInstanceProcAddr*, PFN_vkGetDeviceProcAddr*);
-
-    using CanPresentFn = std::function<bool(VkInstance, VkPhysicalDevice,
-                                            uint32_t queueFamilyIndex)>;
-
-    bool CreateVkBackendContext(const GrVkInterface::GetInstanceProc& getInstanceProc,
-                                const GrVkInterface::GetDeviceProc& getDeviceProc,
-                                GrVkBackendContext* ctx,
-                                uint32_t* presentQueueIndexPtr = nullptr,
-                                CanPresentFn canPresent = CanPresentFn());
 }
 
 #endif
diff --git a/tools/sk_app/VulkanWindowContext.cpp b/tools/sk_app/VulkanWindowContext.cpp
index 411f114e63..ad0e15ca7b 100644
--- a/tools/sk_app/VulkanWindowContext.cpp
+++ b/tools/sk_app/VulkanWindowContext.cpp
@@ -13,6 +13,7 @@
 #include "VulkanWindowContext.h"
 
 #include "vk/GrVkImage.h"
+#include "vk/GrVkInterface.h"
 #include "vk/GrVkUtil.h"
 #include "vk/GrVkTypes.h"
 
@@ -21,8 +22,8 @@
 #undef CreateSemaphore
 #endif
 
-#define GET_PROC(F) f ## F = (PFN_vk ## F) fGetInstanceProcAddr(fInstance, "vk" #F)
-#define GET_DEV_PROC(F) f ## F = (PFN_vk ## F) fGetDeviceProcAddr(fDevice, "vk" #F)
+#define GET_PROC(F) f ## F = (PFN_vk ## F) fGetInstanceProcAddr(instance, "vk" #F)
+#define GET_DEV_PROC(F) f ## F = (PFN_vk ## F) fGetDeviceProcAddr(device, "vk" #F)
 
 namespace sk_app {
 
@@ -48,34 +49,22 @@ VulkanWindowContext::VulkanWindowContext(const DisplayParams& params,
 
 void VulkanWindowContext::initializeContext() {
     // any config code here (particularly for msaa)?
+    fBackendContext.reset(GrVkBackendContext::Create(fGetInstanceProcAddr, fGetDeviceProcAddr,
+                                                     &fPresentQueueIndex, fCanPresentFn));
 
-    GrVkBackendContext backendContext;
-    if (!sk_gpu_test::CreateVkBackendContext(fGetInstanceProcAddr, fGetDeviceProcAddr,
-                                             &backendContext, &fPresentQueueIndex, fCanPresentFn)) {
+    if (!(fBackendContext->fExtensions & kKHR_surface_GrVkExtensionFlag) ||
+        !(fBackendContext->fExtensions & kKHR_swapchain_GrVkExtensionFlag)) {
+        fBackendContext.reset(nullptr);
         return;
     }
 
-    if (!(backendContext.fExtensions & kKHR_surface_GrVkExtensionFlag) ||
-        !(backendContext.fExtensions & kKHR_swapchain_GrVkExtensionFlag)) {
-        return;
-    }
-
-    fInstance = backendContext.fInstance;
-    fPhysicalDevice = backendContext.fPhysicalDevice;
-    fDevice = backendContext.fDevice;
-    fGraphicsQueueIndex = backendContext.fGraphicsQueueIndex;
-    fGraphicsQueue = backendContext.fQueue;
-    fInterface = backendContext.fInterface;
-
-    GET_PROC(DestroyInstance);
+    VkInstance instance = fBackendContext->fInstance;
+    VkDevice device = fBackendContext->fDevice;
     GET_PROC(DestroySurfaceKHR);
     GET_PROC(GetPhysicalDeviceSurfaceSupportKHR);
     GET_PROC(GetPhysicalDeviceSurfaceCapabilitiesKHR);
     GET_PROC(GetPhysicalDeviceSurfaceFormatsKHR);
     GET_PROC(GetPhysicalDeviceSurfacePresentModesKHR);
-    GET_DEV_PROC(DeviceWaitIdle);
-    GET_DEV_PROC(QueueWaitIdle);
-    GET_DEV_PROC(DestroyDevice);
     GET_DEV_PROC(CreateSwapchainKHR);
     GET_DEV_PROC(DestroySwapchainKHR);
     GET_DEV_PROC(GetSwapchainImagesKHR);
@@ -83,17 +72,18 @@ void VulkanWindowContext::initializeContext() {
     GET_DEV_PROC(QueuePresentKHR);
     GET_DEV_PROC(GetDeviceQueue);
 
-    fContext = GrContext::MakeVulkan(backendContext, fDisplayParams.fGrContextOptions);
+    fContext = GrContext::MakeVulkan(fBackendContext, fDisplayParams.fGrContextOptions);
 
-    fSurface = fCreateVkSurfaceFn(fInstance);
+    fSurface = fCreateVkSurfaceFn(instance);
     if (VK_NULL_HANDLE == fSurface) {
-        this->destroyContext();
+        fBackendContext.reset(nullptr);
         return;
     }
 
     VkBool32 supported;
-    VkResult res = fGetPhysicalDeviceSurfaceSupportKHR(fPhysicalDevice, fPresentQueueIndex,
-                                                       fSurface, &supported);
+    VkResult res = fGetPhysicalDeviceSurfaceSupportKHR(fBackendContext->fPhysicalDevice,
+                                                       fPresentQueueIndex, fSurface,
+                                                       &supported);
     if (VK_SUCCESS != res) {
         this->destroyContext();
         return;
@@ -105,44 +95,45 @@ void VulkanWindowContext::initializeContext() {
     }
 
     // create presentQueue
-    fGetDeviceQueue(fDevice, fPresentQueueIndex, 0, &fPresentQueue);
+    fGetDeviceQueue(fBackendContext->fDevice, fPresentQueueIndex, 0, &fPresentQueue);
 }
 
 bool VulkanWindowContext::createSwapchain(int width, int height,
                                           const DisplayParams& params) {
     // check for capabilities
     VkSurfaceCapabilitiesKHR caps;
-    VkResult res = fGetPhysicalDeviceSurfaceCapabilitiesKHR(fPhysicalDevice, fSurface, &caps);
+    VkResult res = fGetPhysicalDeviceSurfaceCapabilitiesKHR(fBackendContext->fPhysicalDevice,
+                                                            fSurface, &caps);
     if (VK_SUCCESS != res) {
         return false;
     }
 
     uint32_t surfaceFormatCount;
-    res = fGetPhysicalDeviceSurfaceFormatsKHR(fPhysicalDevice, fSurface, &surfaceFormatCount,
-                                              nullptr);
+    res = fGetPhysicalDeviceSurfaceFormatsKHR(fBackendContext->fPhysicalDevice, fSurface,
+                                              &surfaceFormatCount, nullptr);
     if (VK_SUCCESS != res) {
         return false;
     }
 
     SkAutoMalloc surfaceFormatAlloc(surfaceFormatCount * sizeof(VkSurfaceFormatKHR));
     VkSurfaceFormatKHR* surfaceFormats = (VkSurfaceFormatKHR*)surfaceFormatAlloc.get();
-    res = fGetPhysicalDeviceSurfaceFormatsKHR(fPhysicalDevice, fSurface, &surfaceFormatCount,
-                                              surfaceFormats);
+    res = fGetPhysicalDeviceSurfaceFormatsKHR(fBackendContext->fPhysicalDevice, fSurface,
+                                              &surfaceFormatCount, surfaceFormats);
     if (VK_SUCCESS != res) {
         return false;
     }
 
     uint32_t presentModeCount;
-    res = fGetPhysicalDeviceSurfacePresentModesKHR(fPhysicalDevice, fSurface, &presentModeCount,
-                                                   nullptr);
+    res = fGetPhysicalDeviceSurfacePresentModesKHR(fBackendContext->fPhysicalDevice, fSurface,
+                                                   &presentModeCount, nullptr);
     if (VK_SUCCESS != res) {
         return false;
     }
 
     SkAutoMalloc presentModeAlloc(presentModeCount * sizeof(VkPresentModeKHR));
     VkPresentModeKHR* presentModes = (VkPresentModeKHR*)presentModeAlloc.get();
-    res = fGetPhysicalDeviceSurfacePresentModesKHR(fPhysicalDevice, fSurface, &presentModeCount,
-                                                   presentModes);
+    res = fGetPhysicalDeviceSurfacePresentModesKHR(fBackendContext->fPhysicalDevice, fSurface,
+                                                   &presentModeCount, presentModes);
     if (VK_SUCCESS != res) {
         return false;
     }
@@ -243,8 +234,8 @@ bool VulkanWindowContext::createSwapchain(int width, int height,
     swapchainCreateInfo.imageArrayLayers = 1;
     swapchainCreateInfo.imageUsage = usageFlags;
 
-    uint32_t queueFamilies[] = { fGraphicsQueueIndex, fPresentQueueIndex };
-    if (fGraphicsQueueIndex != fPresentQueueIndex) {
+    uint32_t queueFamilies[] = { fBackendContext->fGraphicsQueueIndex, fPresentQueueIndex };
+    if (fBackendContext->fGraphicsQueueIndex != fPresentQueueIndex) {
         swapchainCreateInfo.imageSharingMode = VK_SHARING_MODE_CONCURRENT;
         swapchainCreateInfo.queueFamilyIndexCount = 2;
         swapchainCreateInfo.pQueueFamilyIndices = queueFamilies;
@@ -260,18 +251,18 @@ bool VulkanWindowContext::createSwapchain(int width, int height,
     swapchainCreateInfo.clipped = true;
     swapchainCreateInfo.oldSwapchain = fSwapchain;
 
-    res = fCreateSwapchainKHR(fDevice, &swapchainCreateInfo, nullptr, &fSwapchain);
+    res = fCreateSwapchainKHR(fBackendContext->fDevice, &swapchainCreateInfo, nullptr, &fSwapchain);
     if (VK_SUCCESS != res) {
         return false;
     }
 
     // destroy the old swapchain
     if (swapchainCreateInfo.oldSwapchain != VK_NULL_HANDLE) {
-        fDeviceWaitIdle(fDevice);
+        GR_VK_CALL(fBackendContext->fInterface, DeviceWaitIdle(fBackendContext->fDevice));
 
         this->destroyBuffers();
 
-        fDestroySwapchainKHR(fDevice, swapchainCreateInfo.oldSwapchain, nullptr);
+        fDestroySwapchainKHR(fBackendContext->fDevice, swapchainCreateInfo.oldSwapchain, nullptr);
     }
 
     this->createBuffers(swapchainCreateInfo.imageFormat, colorType);
@@ -280,10 +271,10 @@ bool VulkanWindowContext::createSwapchain(int width, int height,
 }
 
 void VulkanWindowContext::createBuffers(VkFormat format, SkColorType colorType) {
-    fGetSwapchainImagesKHR(fDevice, fSwapchain, &fImageCount, nullptr);
+    fGetSwapchainImagesKHR(fBackendContext->fDevice, fSwapchain, &fImageCount, nullptr);
     SkASSERT(fImageCount);
     fImages = new VkImage[fImageCount];
-    fGetSwapchainImagesKHR(fDevice, fSwapchain, &fImageCount, fImages);
+    fGetSwapchainImagesKHR(fBackendContext->fDevice, fSwapchain, &fImageCount, fImages);
 
     // set up initial image layouts and create surfaces
     fImageLayouts = new VkImageLayout[fImageCount];
@@ -315,10 +306,10 @@ void VulkanWindowContext::createBuffers(VkFormat format, SkColorType colorType)
         memset(&commandPoolInfo, 0, sizeof(VkCommandPoolCreateInfo));
         commandPoolInfo.sType = VK_STRUCTURE_TYPE_COMMAND_POOL_CREATE_INFO;
         // this needs to be on the render queue
-        commandPoolInfo.queueFamilyIndex = fGraphicsQueueIndex;
+        commandPoolInfo.queueFamilyIndex = fBackendContext->fGraphicsQueueIndex;
         commandPoolInfo.flags = VK_COMMAND_POOL_CREATE_RESET_COMMAND_BUFFER_BIT;
-        GR_VK_CALL_ERRCHECK(fInterface,
-                            CreateCommandPool(fDevice, &commandPoolInfo,
+        GR_VK_CALL_ERRCHECK(fBackendContext->fInterface,
+                            CreateCommandPool(fBackendContext->fDevice, &commandPoolInfo,
                                               nullptr, &fCommandPool));
     }
 
@@ -346,20 +337,20 @@ void VulkanWindowContext::createBuffers(VkFormat format, SkColorType colorType)
     fBackbuffers = new BackbufferInfo[fImageCount + 1];
     for (uint32_t i = 0; i < fImageCount + 1; ++i) {
         fBackbuffers[i].fImageIndex = -1;
-        GR_VK_CALL_ERRCHECK(fInterface,
-                            CreateSemaphore(fDevice, &semaphoreInfo,
+        GR_VK_CALL_ERRCHECK(fBackendContext->fInterface,
+                            CreateSemaphore(fBackendContext->fDevice, &semaphoreInfo,
                                             nullptr, &fBackbuffers[i].fAcquireSemaphore));
-        GR_VK_CALL_ERRCHECK(fInterface,
-                            CreateSemaphore(fDevice, &semaphoreInfo,
+        GR_VK_CALL_ERRCHECK(fBackendContext->fInterface,
+                            CreateSemaphore(fBackendContext->fDevice, &semaphoreInfo,
                                             nullptr, &fBackbuffers[i].fRenderSemaphore));
-        GR_VK_CALL_ERRCHECK(fInterface,
-                            AllocateCommandBuffers(fDevice, &commandBuffersInfo,
+        GR_VK_CALL_ERRCHECK(fBackendContext->fInterface,
+                            AllocateCommandBuffers(fBackendContext->fDevice, &commandBuffersInfo,
                                                    fBackbuffers[i].fTransitionCmdBuffers));
-        GR_VK_CALL_ERRCHECK(fInterface,
-                            CreateFence(fDevice, &fenceInfo, nullptr,
+        GR_VK_CALL_ERRCHECK(fBackendContext->fInterface,
+                            CreateFence(fBackendContext->fDevice, &fenceInfo, nullptr,
                                         &fBackbuffers[i].fUsageFences[0]));
-        GR_VK_CALL_ERRCHECK(fInterface,
-                            CreateFence(fDevice, &fenceInfo, nullptr,
+        GR_VK_CALL_ERRCHECK(fBackendContext->fInterface,
+                            CreateFence(fBackendContext->fDevice, &fenceInfo, nullptr,
                                         &fBackbuffers[i].fUsageFences[1]));
     }
     fCurrentBackbufferIndex = fImageCount;
@@ -369,26 +360,26 @@ void VulkanWindowContext::destroyBuffers() {
 
     if (fBackbuffers) {
         for (uint32_t i = 0; i < fImageCount + 1; ++i) {
-            GR_VK_CALL_ERRCHECK(fInterface,
-                                WaitForFences(fDevice, 2,
+            GR_VK_CALL_ERRCHECK(fBackendContext->fInterface,
+                                WaitForFences(fBackendContext->fDevice, 2,
                                               fBackbuffers[i].fUsageFences,
                                               true, UINT64_MAX));
             fBackbuffers[i].fImageIndex = -1;
-            GR_VK_CALL(fInterface,
-                       DestroySemaphore(fDevice,
+            GR_VK_CALL(fBackendContext->fInterface,
+                       DestroySemaphore(fBackendContext->fDevice,
                                         fBackbuffers[i].fAcquireSemaphore,
                                         nullptr));
-            GR_VK_CALL(fInterface,
-                       DestroySemaphore(fDevice,
+            GR_VK_CALL(fBackendContext->fInterface,
+                       DestroySemaphore(fBackendContext->fDevice,
                                         fBackbuffers[i].fRenderSemaphore,
                                         nullptr));
-            GR_VK_CALL(fInterface,
-                       FreeCommandBuffers(fDevice, fCommandPool, 2,
+            GR_VK_CALL(fBackendContext->fInterface,
+                       FreeCommandBuffers(fBackendContext->fDevice, fCommandPool, 2,
                                           fBackbuffers[i].fTransitionCmdBuffers));
-            GR_VK_CALL(fInterface,
-                       DestroyFence(fDevice, fBackbuffers[i].fUsageFences[0], 0));
-            GR_VK_CALL(fInterface,
-                       DestroyFence(fDevice, fBackbuffers[i].fUsageFences[1], 0));
+            GR_VK_CALL(fBackendContext->fInterface,
+                       DestroyFence(fBackendContext->fDevice, fBackbuffers[i].fUsageFences[0], 0));
+            GR_VK_CALL(fBackendContext->fInterface,
+                       DestroyFence(fBackendContext->fDevice, fBackbuffers[i].fUsageFences[1], 0));
         }
     }
 
@@ -409,43 +400,34 @@ VulkanWindowContext::~VulkanWindowContext() {
 }
 
 void VulkanWindowContext::destroyContext() {
-    if (!this->isValid()) {
+    if (!fBackendContext.get()) {
         return;
     }
 
-    fQueueWaitIdle(fPresentQueue);
-    fDeviceWaitIdle(fDevice);
+    GR_VK_CALL(fBackendContext->fInterface, QueueWaitIdle(fPresentQueue));
+    GR_VK_CALL(fBackendContext->fInterface, DeviceWaitIdle(fBackendContext->fDevice));
 
     this->destroyBuffers();
 
     if (VK_NULL_HANDLE != fCommandPool) {
-        GR_VK_CALL(fInterface, DestroyCommandPool(fDevice, fCommandPool, nullptr));
+        GR_VK_CALL(fBackendContext->fInterface, DestroyCommandPool(fBackendContext->fDevice,
+                                                                   fCommandPool, nullptr));
         fCommandPool = VK_NULL_HANDLE;
     }
 
     if (VK_NULL_HANDLE != fSwapchain) {
-        fDestroySwapchainKHR(fDevice, fSwapchain, nullptr);
+        fDestroySwapchainKHR(fBackendContext->fDevice, fSwapchain, nullptr);
         fSwapchain = VK_NULL_HANDLE;
     }
 
     if (VK_NULL_HANDLE != fSurface) {
-        fDestroySurfaceKHR(fInstance, fSurface, nullptr);
+        fDestroySurfaceKHR(fBackendContext->fInstance, fSurface, nullptr);
         fSurface = VK_NULL_HANDLE;
     }
 
     fContext.reset();
-    fInterface.reset();
-
-    if (VK_NULL_HANDLE != fDevice) {
-        fDestroyDevice(fDevice, nullptr);
-        fDevice = VK_NULL_HANDLE;
-    }
-    fPhysicalDevice = VK_NULL_HANDLE;
 
-    if (VK_NULL_HANDLE != fInstance) {
-        fDestroyInstance(fInstance, nullptr);
-        fInstance = VK_NULL_HANDLE;
-    }
+    fBackendContext.reset(nullptr);
 }
 
 VulkanWindowContext::BackbufferInfo* VulkanWindowContext::getAvailableBackbuffer() {
@@ -457,8 +439,8 @@ VulkanWindowContext::BackbufferInfo* VulkanWindowContext::getAvailableBackbuffer
     }
 
     BackbufferInfo* backbuffer = fBackbuffers + fCurrentBackbufferIndex;
-    GR_VK_CALL_ERRCHECK(fInterface,
-                        WaitForFences(fDevice, 2, backbuffer->fUsageFences,
+    GR_VK_CALL_ERRCHECK(fBackendContext->fInterface,
+                        WaitForFences(fBackendContext->fDevice, 2, backbuffer->fUsageFences,
                                       true, UINT64_MAX));
     return backbuffer;
 }
@@ -468,12 +450,12 @@ sk_sp<SkSurface> VulkanWindowContext::getBackbufferSurface() {
     SkASSERT(backbuffer);
 
     // reset the fence
-    GR_VK_CALL_ERRCHECK(fInterface,
-                        ResetFences(fDevice, 2, backbuffer->fUsageFences));
+    GR_VK_CALL_ERRCHECK(fBackendContext->fInterface,
+                        ResetFences(fBackendContext->fDevice, 2, backbuffer->fUsageFences));
     // semaphores should be in unsignaled state
 
     // acquire the image
-    VkResult res = fAcquireNextImageKHR(fDevice, fSwapchain, UINT64_MAX,
+    VkResult res = fAcquireNextImageKHR(fBackendContext->fDevice, fSwapchain, UINT64_MAX,
                                         backbuffer->fAcquireSemaphore, VK_NULL_HANDLE,
                                         &backbuffer->fImageIndex);
     if (VK_ERROR_SURFACE_LOST_KHR == res) {
@@ -487,11 +469,11 @@ sk_sp<SkSurface> VulkanWindowContext::getBackbufferSurface() {
             return nullptr;
         }
         backbuffer = this->getAvailableBackbuffer();
-        GR_VK_CALL_ERRCHECK(fInterface,
-                            ResetFences(fDevice, 2, backbuffer->fUsageFences));
+        GR_VK_CALL_ERRCHECK(fBackendContext->fInterface,
+                            ResetFences(fBackendContext->fDevice, 2, backbuffer->fUsageFences));
 
         // acquire the image
-        res = fAcquireNextImageKHR(fDevice, fSwapchain, UINT64_MAX,
+        res = fAcquireNextImageKHR(fBackendContext->fDevice, fSwapchain, UINT64_MAX,
                                    backbuffer->fAcquireSemaphore, VK_NULL_HANDLE,
                                    &backbuffer->fImageIndex);
 
@@ -519,27 +501,27 @@ sk_sp<SkSurface> VulkanWindowContext::getBackbufferSurface() {
         layout,                                   // oldLayout
         VK_IMAGE_LAYOUT_COLOR_ATTACHMENT_OPTIMAL, // newLayout
         fPresentQueueIndex,                       // srcQueueFamilyIndex
-        fGraphicsQueueIndex,                      // dstQueueFamilyIndex
+        fBackendContext->fGraphicsQueueIndex,     // dstQueueFamilyIndex
         fImages[backbuffer->fImageIndex],         // image
         { VK_IMAGE_ASPECT_COLOR_BIT, 0, 1, 0, 1 } // subresourceRange
     };
-    GR_VK_CALL_ERRCHECK(fInterface,
+    GR_VK_CALL_ERRCHECK(fBackendContext->fInterface,
                         ResetCommandBuffer(backbuffer->fTransitionCmdBuffers[0], 0));
     VkCommandBufferBeginInfo info;
     memset(&info, 0, sizeof(VkCommandBufferBeginInfo));
     info.sType = VK_STRUCTURE_TYPE_COMMAND_BUFFER_BEGIN_INFO;
     info.flags = 0;
-    GR_VK_CALL_ERRCHECK(fInterface,
+    GR_VK_CALL_ERRCHECK(fBackendContext->fInterface,
                         BeginCommandBuffer(backbuffer->fTransitionCmdBuffers[0], &info));
 
-    GR_VK_CALL(fInterface,
+    GR_VK_CALL(fBackendContext->fInterface,
                CmdPipelineBarrier(backbuffer->fTransitionCmdBuffers[0],
                                   srcStageMask, dstStageMask, 0,
                                   0, nullptr,
                                   0, nullptr,
                                   1, &imageMemoryBarrier));
 
-    GR_VK_CALL_ERRCHECK(fInterface,
+    GR_VK_CALL_ERRCHECK(fBackendContext->fInterface,
                         EndCommandBuffer(backbuffer->fTransitionCmdBuffers[0]));
 
     VkPipelineStageFlags waitDstStageFlags = VK_PIPELINE_STAGE_COLOR_ATTACHMENT_OUTPUT_BIT;
@@ -554,8 +536,8 @@ sk_sp<SkSurface> VulkanWindowContext::getBackbufferSurface() {
     submitInfo.pCommandBuffers = &backbuffer->fTransitionCmdBuffers[0];
     submitInfo.signalSemaphoreCount = 0;
 
-    GR_VK_CALL_ERRCHECK(fInterface,
-                        QueueSubmit(fGraphicsQueue, 1, &submitInfo,
+    GR_VK_CALL_ERRCHECK(fBackendContext->fInterface,
+                        QueueSubmit(fBackendContext->fQueue, 1, &submitInfo,
                                     backbuffer->fUsageFences[0]));
 
     SkSurface* surface = fSurfaces[backbuffer->fImageIndex].get();
@@ -592,26 +574,26 @@ void VulkanWindowContext::swapBuffers() {
         dstAccessMask,                            // inputMask
         layout,                                   // oldLayout
         VK_IMAGE_LAYOUT_PRESENT_SRC_KHR,          // newLayout
-        fGraphicsQueueIndex,                      // srcQueueFamilyIndex
+        fBackendContext->fGraphicsQueueIndex,     // srcQueueFamilyIndex
         fPresentQueueIndex,                       // dstQueueFamilyIndex
         fImages[backbuffer->fImageIndex],         // image
         { VK_IMAGE_ASPECT_COLOR_BIT, 0, 1, 0, 1 } // subresourceRange
     };
-    GR_VK_CALL_ERRCHECK(fInterface,
+    GR_VK_CALL_ERRCHECK(fBackendContext->fInterface,
                         ResetCommandBuffer(backbuffer->fTransitionCmdBuffers[1], 0));
     VkCommandBufferBeginInfo info;
     memset(&info, 0, sizeof(VkCommandBufferBeginInfo));
     info.sType = VK_STRUCTURE_TYPE_COMMAND_BUFFER_BEGIN_INFO;
     info.flags = 0;
-    GR_VK_CALL_ERRCHECK(fInterface,
+    GR_VK_CALL_ERRCHECK(fBackendContext->fInterface,
                         BeginCommandBuffer(backbuffer->fTransitionCmdBuffers[1], &info));
-    GR_VK_CALL(fInterface,
+    GR_VK_CALL(fBackendContext->fInterface,
                CmdPipelineBarrier(backbuffer->fTransitionCmdBuffers[1],
                                   srcStageMask, dstStageMask, 0,
                                   0, nullptr,
                                   0, nullptr,
                                   1, &imageMemoryBarrier));
-    GR_VK_CALL_ERRCHECK(fInterface,
+    GR_VK_CALL_ERRCHECK(fBackendContext->fInterface,
                         EndCommandBuffer(backbuffer->fTransitionCmdBuffers[1]));
 
     fImageLayouts[backbuffer->fImageIndex] = VK_IMAGE_LAYOUT_PRESENT_SRC_KHR;
@@ -627,8 +609,8 @@ void VulkanWindowContext::swapBuffers() {
     submitInfo.signalSemaphoreCount = 1;
     submitInfo.pSignalSemaphores = &backbuffer->fRenderSemaphore;
 
-    GR_VK_CALL_ERRCHECK(fInterface,
-                        QueueSubmit(fGraphicsQueue, 1, &submitInfo,
+    GR_VK_CALL_ERRCHECK(fBackendContext->fInterface,
+                        QueueSubmit(fBackendContext->fQueue, 1, &submitInfo,
                                     backbuffer->fUsageFences[1]));
 
     // Submit present operation to present queue
diff --git a/tools/sk_app/VulkanWindowContext.h b/tools/sk_app/VulkanWindowContext.h
index 79298f6b38..1fca9dc83e 100644
--- a/tools/sk_app/VulkanWindowContext.h
+++ b/tools/sk_app/VulkanWindowContext.h
@@ -13,8 +13,6 @@
 #ifdef SK_VULKAN
 
 #include "vk/GrVkBackendContext.h"
-#include "vk/GrVkInterface.h"
-#include "vk/VkTestUtils.h"
 #include "WindowContext.h"
 
 class GrRenderTarget;
@@ -28,7 +26,7 @@ public:
     sk_sp<SkSurface> getBackbufferSurface() override;
     void swapBuffers() override;
 
-    bool isValid() override { return fDevice != VK_NULL_HANDLE; }
+    bool isValid() override { return SkToBool(fBackendContext.get()); }
 
     void resize(int w, int h) override {
         this->createSwapchain(w, h, fDisplayParams);
@@ -43,7 +41,7 @@ public:
     /** Platform specific function that creates a VkSurfaceKHR for a window */
     using CreateVkSurfaceFn = std::function<VkSurfaceKHR(VkInstance)>;
     /** Platform specific function that determines whether presentation will succeed. */
-    using CanPresentFn = sk_gpu_test::CanPresentFn;
+    using CanPresentFn = GrVkBackendContext::CanPresentFn;
 
     VulkanWindowContext(const DisplayParams&, CreateVkSurfaceFn, CanPresentFn,
                         PFN_vkGetInstanceProcAddr, PFN_vkGetDeviceProcAddr);
@@ -65,9 +63,7 @@ private:
     void createBuffers(VkFormat format, SkColorType colorType);
     void destroyBuffers();
 
-    VkInstance fInstance = VK_NULL_HANDLE;
-    VkPhysicalDevice fPhysicalDevice = VK_NULL_HANDLE;
-    VkDevice fDevice = VK_NULL_HANDLE;
+    sk_sp<const GrVkBackendContext> fBackendContext;
 
     // simple wrapper class that exists only to initialize a pointer to NULL
     template <typename FNPTR_TYPE> class VkPtr {
@@ -99,19 +95,10 @@ private:
     VkPtr<PFN_vkGetSwapchainImagesKHR> fGetSwapchainImagesKHR;
     VkPtr<PFN_vkAcquireNextImageKHR> fAcquireNextImageKHR;
     VkPtr<PFN_vkQueuePresentKHR> fQueuePresentKHR;
-
-    VkPtr<PFN_vkDestroyInstance> fDestroyInstance;
-    VkPtr<PFN_vkDeviceWaitIdle> fDeviceWaitIdle;
-    VkPtr<PFN_vkQueueWaitIdle> fQueueWaitIdle;
-    VkPtr<PFN_vkDestroyDevice> fDestroyDevice;
     VkPtr<PFN_vkGetDeviceQueue> fGetDeviceQueue;
 
-    sk_sp<const GrVkInterface> fInterface;
-
     VkSurfaceKHR      fSurface;
     VkSwapchainKHR    fSwapchain;
-    uint32_t          fGraphicsQueueIndex;
-    VkQueue           fGraphicsQueue;
     uint32_t          fPresentQueueIndex;
     VkQueue           fPresentQueue;