Implement a benchmark for GrResourceCache

src/core/SkCanvas.cpp

Index: src/core/SkCanvas.cpp
diff --git a/src/core/SkCanvas.cpp b/src/core/SkCanvas.cpp
index 0d5fccb91f39e5d232c53c35c448cec91c517d6c..4eaea11b87e582848b944ac31701d05156cb0db4 100644
--- a/src/core/SkCanvas.cpp
+++ b/src/core/SkCanvas.cpp
@@ -26,6 +26,10 @@
 #include "SkTLazy.h"
 #include "SkUtils.h"
 
+#if SK_SUPPORT_GPU
+#include "GrRenderTarget.h"
+#endif
+
 SK_DEFINE_INST_COUNT(SkBounder)
 SK_DEFINE_INST_COUNT(SkCanvas)
 SK_DEFINE_INST_COUNT(SkDrawFilter)
@@ -1570,6 +1574,20 @@ SkBaseDevice* SkCanvas::createCompatibleDevice(SkBitmap::Config config,
     }
 }
 
+GrContext* SkCanvas::getGrContext() {
+#if SK_SUPPORT_GPU
+    SkBaseDevice* device = this->getTopDevice();
+    if (NULL != device) {
+        GrRenderTarget* renderTarget = device->accessRenderTarget();
+        if (NULL != renderTarget) {
+            return renderTarget->getContext();
+        }
+    }
+#endif
+
+    return NULL;
+
+}
 
 //////////////////////////////////////////////////////////////////////////////
 //  These are the virtual drawing methods