UMA metrics for use count of wheel and touch scrolls.

cc/trees/layer_tree_host.h

 // Copyright 2011 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_H_
 #define CC_TREES_LAYER_TREE_HOST_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 488 matching lines @@
   scoped_refptr<base::SequencedTaskRunner> image_worker_task_runner_;
 
  private:
   friend class LayerTreeHostSerializationTest;
 
   // This is the number of consecutive frames in which we want the content to be
   // suitable for GPU rasterization before re-enabling it.
   enum { kNumFramesToConsiderBeforeGpuRasterization = 60 };
 
   void ApplyViewportDeltas(ScrollAndScaleSet* info);
+  void RecordWheelAndTouchScrollingCount(ScrollAndScaleSet* info);
   void ApplyPageScaleDeltaFromImplSide(float page_scale_delta);
   void InitializeProxy(std::unique_ptr<Proxy> proxy);
 
   bool DoUpdateLayers(Layer* root_layer);
 
   void UpdateDeferCommitsInternal();
 
   const CompositorMode compositor_mode_;
 
   std::unique_ptr<UIResourceManager> ui_resource_manager_;
@@ skipping 102 matching lines @@
 
   std::vector<std::pair<sk_sp<const SkImage>, base::Callback<void(bool)>>>
       queued_image_decodes_;
 
   DISALLOW_COPY_AND_ASSIGN(LayerTreeHost);
 };
 
 }  // namespace cc
 
 #endif  // CC_TREES_LAYER_TREE_HOST_H_