cc: Add invalidation micro benchmark.

cc/debug/invalidation_benchmark.h

+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef CC_DEBUG_INVALIDATION_BENCHMARK_H_
+#define CC_DEBUG_INVALIDATION_BENCHMARK_H_
+
+#include <string>
+
+#include "cc/debug/micro_benchmark_controller.h"
+
+namespace cc {
+
+class LayerTreeHost;
+class Layer;
+// NOTE: this benchmark will not measure or return any results, it will simply
+// invalidate a certain area of each layer every frame. It is intended to be
+// used in combination with a telemetry benchmark that does the actual
+// measurement.
+class CC_EXPORT InvalidationBenchmark : public MicroBenchmark {
+ public:
+  explicit InvalidationBenchmark(scoped_ptr<base::Value> value,
+                                 const MicroBenchmark::DoneCallback& callback);
+  virtual ~InvalidationBenchmark();
+
+  // Implements MicroBenchmark interface.
+  virtual void DidUpdateLayers(LayerTreeHost* host) OVERRIDE;
+  virtual void RunOnLayer(PictureLayer* layer) OVERRIDE;
+
+ private:
+  enum Mode { LAYER, VIEWPORT, RANDOM };
+
+  void Run(Layer* layer);
+  float LCGRandom();
+
+  Mode mode_;
+  uint32 seed_;
+};
+
+}  // namespace cc
+
+#endif  // CC_DEBUG_INVALIDATION_BENCHMARK_H_