Implement a benchmark for GrResourceCache

gm/gm.cpp

Index: gm/gm.cpp
diff --git a/gm/gm.cpp b/gm/gm.cpp
index 9da1a17159a65146a7749357549f871f2c530175..29d02d150a73e4ff88fb914b03f433de735f3331 100644
--- a/gm/gm.cpp
+++ b/gm/gm.cpp
@@ -63,18 +63,5 @@ void GM::drawSizeBounds(SkCanvas* canvas, SkColor color) {
     canvas->drawRect(r, paint);
 }
 
-#if SK_SUPPORT_GPU
-// canvas could almost be a const&, but accessRenderTarget isn't const.
-/*static*/ GrContext* GM::GetGr(SkCanvas* canvas) {
-    SkASSERT(NULL != canvas);
-    SkBaseDevice* device = canvas->getTopDevice();
-    GrRenderTarget* renderTarget = device->accessRenderTarget();
-    if (NULL != renderTarget) {
-        return renderTarget->getContext();
-    }
-    return NULL;
-}
-#endif
-
 // need to explicitly declare this, or we get some weird infinite loop llist
 template GMRegistry* SkTRegistry<GM*(*)(void*)>::gHead;