UMA metrics for use count of wheel and touch scrolls.

content/renderer/gpu/render_widget_compositor.h

 // Copyright (c) 2013 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 CONTENT_RENDERER_GPU_RENDER_WIDGET_COMPOSITOR_H_
 #define CONTENT_RENDERER_GPU_RENDER_WIDGET_COMPOSITOR_H_
 
 #include <stdint.h>
 
 #include "base/callback.h"
@@ skipping 173 matching lines @@
   void WillBeginMainFrame() override;
   void DidBeginMainFrame() override;
   void BeginMainFrame(const cc::BeginFrameArgs& args) override;
   void BeginMainFrameNotExpectedSoon() override;
   void UpdateLayerTreeHost() override;
   void ApplyViewportDeltas(const gfx::Vector2dF& inner_delta,
                            const gfx::Vector2dF& outer_delta,
                            const gfx::Vector2dF& elastic_overscroll_delta,
                            float page_scale,
                            float top_controls_delta) override;
+  void RecordWheelAndTouchScrollingCount(bool has_scrolled_by_wheel,
+                                         bool has_scrolled_by_touch) override;
   void RequestNewCompositorFrameSink() override;
   void DidInitializeCompositorFrameSink() override;
   void DidFailToInitializeCompositorFrameSink() override;
   void WillCommit() override;
   void DidCommit() override;
   void DidCommitAndDrawFrame() override;
   void DidReceiveCompositorFrameAck() override;
   void DidCompletePageScaleAnimation() override;
 
   // cc::LayerTreeHostSingleThreadClient implementation.
@@ skipping 34 matching lines @@
   blink::WebLayoutAndPaintAsyncCallback* layout_and_paint_async_callback_;
 
   cc::FrameSinkId frame_sink_id_;
 
   base::WeakPtrFactory<RenderWidgetCompositor> weak_factory_;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_GPU_RENDER_WIDGET_COMPOSITOR_H_