Implement Vulkan GrBackendObject for textures.

src/gpu/vk/GrVkTextureRenderTarget.h

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 
 #ifndef GrVkTextureRenderTarget_DEFINED
 #define GrVkTextureRenderTarget_DEFINED
 
 #include "GrVkTexture.h"
 #include "GrVkRenderTarget.h"
 #include "GrVkGpu.h"
 
 #ifdef SK_BUILD_FOR_WIN
 // Windows gives bogus warnings about inheriting asTexture/asRenderTarget via dominance.
 #pragma warning(push)
 #pragma warning(disable: 4250)
 #endif
 
 class GrVkImageView;
+struct GrVkTextureInfo;
 
 class GrVkTextureRenderTarget: public GrVkTexture, public GrVkRenderTarget {
 public:
     static GrVkTextureRenderTarget* CreateNewTextureRenderTarget(GrVkGpu*, const GrSurfaceDesc&,
                                                                  GrGpuResource::LifeCycle,
                                                                  const GrVkImage::ImageDesc&);
 
     static GrVkTextureRenderTarget* CreateWrappedTextureRenderTarget(GrVkGpu*, 
                                                                      const GrSurfaceDesc&,
                                                                      GrGpuResource::LifeCycle,
                                                                      VkFormat,
-                                                                     GrVkImage::Resource*);
+                                                                     const GrVkTextureInfo*);
 
 protected:
     void onAbandon() override {
         GrVkRenderTarget::onAbandon();
         GrVkTexture::onAbandon();
     }
 
     void onRelease() override {
         GrVkRenderTarget::onRelease();
         GrVkTexture::onRelease();
@@ skipping 35 matching lines @@
                                            VkFormat format,
                                            const GrVkImage::Resource* imageResource);
 
     // GrGLRenderTarget accounts for the texture's memory and any MSAA renderbuffer's memory.
     size_t onGpuMemorySize() const override {
         return GrVkRenderTarget::onGpuMemorySize();
     }
 };
 
 #endif