implemented wrapped backend texture/rendertarget/textureRT for Metal gpu backend

Bug: skia:
Change-Id: I5d84f9f4340023301bf119731d0b544649be7ab0
Reviewed-on: https://skia-review.googlesource.com/137892
Reviewed-by: Ethan Nicholas <ethannicholas@google.com>
Reviewed-by: Greg Daniel <egdaniel@google.com>
Commit-Queue: Timothy Liang <timliang@google.com>

1 files changed, 4 insertions, 12 deletions

diff --git a/src/gpu/mtl/GrMtlGpu.h b/src/gpu/mtl/GrMtlGpu.h
index b230ef73d7..22fc733217 100644
--- a/src/gpu/mtl/GrMtlGpu.h
+++ b/src/gpu/mtl/GrMtlGpu.h
@@ -73,24 +73,16 @@ private:
     sk_sp<GrTexture> onCreateTexture(const GrSurfaceDesc& desc, SkBudgeted budgeted,
                                      const GrMipLevel texels[], int mipLevelCount) override;
 
-    sk_sp<GrTexture> onWrapBackendTexture(const GrBackendTexture&, GrWrapOwnership) override {
-        return nullptr;
-    }
+    sk_sp<GrTexture> onWrapBackendTexture(const GrBackendTexture&, GrWrapOwnership) override;
 
     sk_sp<GrTexture> onWrapRenderableBackendTexture(const GrBackendTexture&,
                                                     int sampleCnt,
-                                                    GrWrapOwnership) override {
-        return nullptr;
-    }
+                                                    GrWrapOwnership) override;
 
-    sk_sp<GrRenderTarget> onWrapBackendRenderTarget(const GrBackendRenderTarget&) override {
-        return nullptr;
-    }
+    sk_sp<GrRenderTarget> onWrapBackendRenderTarget(const GrBackendRenderTarget&) override;
 
     sk_sp<GrRenderTarget> onWrapBackendTextureAsRenderTarget(const GrBackendTexture&,
-                                                             int sampleCnt) override {
-        return nullptr;
-    }
+                                                             int sampleCnt) override;
 
     GrBuffer* onCreateBuffer(size_t, GrBufferType, GrAccessPattern, const void*) override {
         return nullptr;