skia: Add support for CHROMIUM_image backed textures.

I created a new abstract base class TextureStorageAllocator that consumers of
Skia can subclass and pass back to Skia. When a surface is created with a
pointer to a TextureStorageAllocator, any textures it creates, or that are
derived from the original surface, will allocate and deallocate storage using
the methods on TextureStorageAllocator.

BUG=https://code.google.com/p/chromium/issues/detail?id=579664
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1623653002

Review URL: https://codereview.chromium.org/1623653002

1 files changed, 5 insertions, 3 deletions

diff --git a/src/image/SkSurface_Gpu.cpp b/src/image/SkSurface_Gpu.cpp
index 2d5645b2b0..f7a31c009b 100644
--- a/src/image/SkSurface_Gpu.cpp
+++ b/src/image/SkSurface_Gpu.cpp
@@ -121,9 +121,11 @@ SkSurface* SkSurface::NewRenderTargetDirect(GrRenderTarget* target, const SkSurf
 }
 
 SkSurface* SkSurface::NewRenderTarget(GrContext* ctx, Budgeted budgeted, const SkImageInfo& info,
-                                      int sampleCount, const SkSurfaceProps* props) {
-    SkAutoTUnref<SkGpuDevice> device(SkGpuDevice::Create(ctx, budgeted, info, sampleCount, props,
-                                                         SkGpuDevice::kClear_InitContents));
+                                      int sampleCount, const SkSurfaceProps* props,
+                                      GrTextureStorageAllocator customAllocator) {
+    SkAutoTUnref<SkGpuDevice> device(SkGpuDevice::Create(
+            ctx, budgeted, info, sampleCount, props, SkGpuDevice::kClear_InitContents,
+            customAllocator));
     if (!device) {
         return nullptr;
     }