Add fixed raster scale use counter histograms.

ui/compositor/compositor.h

 // Copyright (c) 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 UI_COMPOSITOR_COMPOSITOR_H_
 #define UI_COMPOSITOR_COMPOSITOR_H_
 
 #include <stdint.h>
 
 #include <memory>
@@ skipping 287 matching lines @@
                            float page_scale,
                            float top_controls_delta) override {}
   void RequestNewOutputSurface() override;
   void DidInitializeOutputSurface() override;
   void DidFailToInitializeOutputSurface() override;
   void WillCommit() override {}
   void DidCommit() override;
   void DidCommitAndDrawFrame() override;
   void DidCompleteSwapBuffers() override;
   void DidCompletePageScaleAnimation() override {}
+  void ReportFixedRasterScaleUseCounters(
+      bool has_blurry_content,
+      bool has_potential_performance_regression) override {}
 
   // cc::LayerTreeHostSingleThreadClient implementation.
   void DidPostSwapBuffers() override;
   void DidAbortSwapBuffers() override;
 
   bool IsLocked() { return compositor_lock_ != NULL; }
 
   void SetOutputIsSecure(bool output_is_secure);
 
   const cc::LayerTreeDebugState& GetLayerTreeDebugState() const;
@@ skipping 53 matching lines @@
   scoped_refptr<cc::AnimationTimeline> animation_timeline_;
 
   base::WeakPtrFactory<Compositor> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(Compositor);
 };
 
 }  // namespace ui
 
 #endif  // UI_COMPOSITOR_COMPOSITOR_H_