Add fixed raster scale use counter histograms.

cc/trees/layer_tree_host_client.h

 // Copyright 2012 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_TREES_LAYER_TREE_HOST_CLIENT_H_
 #define CC_TREES_LAYER_TREE_HOST_CLIENT_H_
 
 #include <memory>
 
 #include "base/memory/ref_counted.h"
@@ skipping 47 matching lines @@
   virtual void DidCommitAndDrawFrame() = 0;
   virtual void DidCompleteSwapBuffers() = 0;
 
   // Called when page scale animation has completed.
   virtual void DidCompletePageScaleAnimation() = 0;
 
   // TODO(simonhong): Makes this to pure virtual function when client
   // implementation is ready.
   virtual void SendBeginFramesToChildren(const BeginFrameArgs& args) {}
 
+  virtual void ReportFixedRasterScaleUseCounters(
+      bool has_blurry_content,
+      bool has_potential_performance_regression) = 0;
+
  protected:
   virtual ~LayerTreeHostClient() {}
 };
 
 }  // namespace cc
 
 #endif  // CC_TREES_LAYER_TREE_HOST_CLIENT_H_