Make GrGpuResource::gpuMemorySize non-virtual w/ onGpuMemorySize virtual impl

include/gpu/GrTexture.h

Index: include/gpu/GrTexture.h
diff --git a/include/gpu/GrTexture.h b/include/gpu/GrTexture.h
index 87f0d5ab0a893826a7500f2b3777d49c57c14114..4989a5e8a0bbb265fd31324d13ff800f327afe42 100644
--- a/include/gpu/GrTexture.h
+++ b/include/gpu/GrTexture.h
@@ -19,11 +19,6 @@ class GrTexturePriv;
 
 class GrTexture : virtual public GrSurface {
 public:
-    /**
-     *  Approximate number of bytes used by the texture
-     */
-    virtual size_t gpuMemorySize() const SK_OVERRIDE;
-
     virtual GrTexture* asTexture() SK_OVERRIDE { return this; }
     virtual const GrTexture* asTexture() const SK_OVERRIDE { return this; }
 
@@ -56,6 +51,7 @@ protected:
     void validateDesc() const;
 
 private:
+    virtual size_t onGpuMemorySize() const SK_OVERRIDE;
     void dirtyMipMaps(bool mipMapsDirty);
 
     enum MipMapsStatus {