Implement a benchmark for GrResourceCache

bench/SkipZeroesBench.cpp

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkBenchmark.h"
 #include "SkBitmap.h"
 #include "SkData.h"
@@ skipping 15 matching lines @@
     , fFilename(filename)
     , fStream()
     , fSkipZeroes(skipZeroes)
     , fValid(false) {
         fName.append(filename);
         if (skipZeroes) {
             fName.append("_skip_zeroes");
         } else {
             fName.append("_write_zeroes");
         }
-        fIsRendering = false;
+    }
+
+    virtual bool isSuitableFor(Backend backend) SK_OVERRIDE {
+        return backend == kNonRendering_Backend;
     }
 
 protected:
     virtual const char* onGetName() SK_OVERRIDE {
         return fName.c_str();
     }
 
     virtual void onPreDraw() SK_OVERRIDE {
         const char* resPath = GetResourcePath().c_str();
         if (NULL == resPath) {
@@ skipping 57 matching lines @@
     SkMemoryStream                  fStream;
     bool                            fSkipZeroes;
     bool                            fValid;
 
     typedef SkBenchmark INHERITED;
 };
 
 // Enable the true version once the feature is checked in.
 DEF_BENCH( return SkNEW_ARGS(SkipZeroesBench, ("arrow.png", true)));
 DEF_BENCH( return SkNEW_ARGS(SkipZeroesBench, ("arrow.png", false)));