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

src/gpu/gl/GrGLStencilBuffer.cpp

Index: src/gpu/gl/GrGLStencilBuffer.cpp
diff --git a/src/gpu/gl/GrGLStencilBuffer.cpp b/src/gpu/gl/GrGLStencilBuffer.cpp
index abcb3c4ba01c75c784b03bb9933cbe6d80978993..fd14ea01f2a6cdf52f7d8b46f3124cbf02688895 100644
--- a/src/gpu/gl/GrGLStencilBuffer.cpp
+++ b/src/gpu/gl/GrGLStencilBuffer.cpp
@@ -13,7 +13,7 @@ GrGLStencilBuffer::~GrGLStencilBuffer() {
     this->release();
 }
 
-size_t GrGLStencilBuffer::gpuMemorySize() const {
+size_t GrGLStencilBuffer::onGpuMemorySize() const {
     uint64_t size = this->width();
     size *= this->height();
     size *= fFormat.fTotalBits;