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

src/gpu/gl/GrGLRenderTarget.cpp

Index: src/gpu/gl/GrGLRenderTarget.cpp
diff --git a/src/gpu/gl/GrGLRenderTarget.cpp b/src/gpu/gl/GrGLRenderTarget.cpp
index 8482ecdc6cf7f53df8e0722495ba49b562349bcb..98813beb2cce1ba03ef574ee9c9939c6370b02a2 100644
--- a/src/gpu/gl/GrGLRenderTarget.cpp
+++ b/src/gpu/gl/GrGLRenderTarget.cpp
@@ -45,7 +45,7 @@ void GrGLRenderTarget::init(const GrSurfaceDesc& desc, const IDDesc& idDesc) {
     } 
 }
 
-size_t GrGLRenderTarget::gpuMemorySize() const {
+size_t GrGLRenderTarget::onGpuMemorySize() const {
     SkASSERT(kUnknown_GrPixelConfig != fDesc.fConfig);
     SkASSERT(!GrPixelConfigIsCompressed(fDesc.fConfig));
     size_t colorBytes = GrBytesPerPixel(fDesc.fConfig);