Add class GrGLTextureRenderTarget for GL texture/rendertarget objects

src/gpu/GrRenderTarget.cpp

Index: src/gpu/GrRenderTarget.cpp
diff --git a/src/gpu/GrRenderTarget.cpp b/src/gpu/GrRenderTarget.cpp
index 7ed70c954ebfc17868369e7be29d4ceca6f6ff87..7aeb4eec1a1596e684529da23c68b03d0da36c48 100644
--- a/src/gpu/GrRenderTarget.cpp
+++ b/src/gpu/GrRenderTarget.cpp
@@ -31,20 +31,6 @@ void GrRenderTarget::discard() {
     context->discardRenderTarget(this);
 }
 
-size_t GrRenderTarget::gpuMemorySize() const {
-    size_t colorBits;
-    if (kUnknown_GrPixelConfig == fDesc.fConfig) {
-        colorBits = 32; // don't know, make a guess
-    } else {
-        colorBits = GrBytesPerPixel(fDesc.fConfig) * 8;
-    }
-    uint64_t size = fDesc.fWidth;
-    size *= fDesc.fHeight;
-    size *= colorBits;
-    size *= SkTMax(1, fDesc.fSampleCnt);
-    return (size_t)(size / 8);
-}
-
 void GrRenderTarget::flagAsNeedingResolve(const SkIRect* rect) {
     if (kCanResolve_ResolveType == getResolveType()) {
         if (rect) {