draft gpu support in nanobench

bench/ImageFilterDAGBench.cpp

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "Benchmark.h"
 #include "SkBlurImageFilter.h"
 #include "SkCanvas.h"
 #include "SkMergeImageFilter.h"
 
 enum { kNumInputs = 5 };
 
 // Exercise a blur filter connected to 5 inputs of the same merge filter.
 // This bench shows an improvement in performance once cacheing of re-used
 // nodes is implemented, since the DAG is no longer flattened to a tree.
 
 class ImageFilterDAGBench : public Benchmark {
 public:
-    ImageFilterDAGBench() {
-    }
+    ImageFilterDAGBench() {}
 
 protected:
     virtual const char* onGetName() SK_OVERRIDE {
         return "image_filter_dag";
     }
 
     virtual void onDraw(const int loops, SkCanvas* canvas) SK_OVERRIDE {
-        SkAutoTUnref<SkImageFilter> blur(SkBlurImageFilter::Create(20.0f, 20.0f));
-        SkImageFilter* inputs[kNumInputs];
-        for (int i = 0; i < kNumInputs; ++i) {
-            inputs[i] = blur.get();
+        for (int j = 0; j < loops; j++) {
+            SkAutoTUnref<SkImageFilter> blur(SkBlurImageFilter::Create(20.0f, 20.0f));
+            SkImageFilter* inputs[kNumInputs];
+            for (int i = 0; i < kNumInputs; ++i) {
+                inputs[i] = blur.get();
+            }
+            SkAutoTUnref<SkImageFilter> merge(SkMergeImageFilter::Create(inputs, kNumInputs));
+            SkPaint paint;
+            paint.setImageFilter(merge);
+            SkRect rect = SkRect::Make(SkIRect::MakeWH(400, 400));
+            canvas->drawRect(rect, paint);
         }
-        SkAutoTUnref<SkImageFilter> merge(SkMergeImageFilter::Create(inputs, kNumInputs));
-        SkPaint paint;
-        paint.setImageFilter(merge);
-        SkRect rect = SkRect::Make(SkIRect::MakeWH(400, 400));
-        canvas->drawRect(rect, paint);
     }
 
 private:
     typedef Benchmark INHERITED;
 };
 
 DEF_BENCH(return new ImageFilterDAGBench;)