UMA metrics for use count of wheel and touch scrolls.

cc/test/stub_layer_tree_host_client.h

 // Copyright 2016 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_TEST_STUB_LAYER_TREE_HOST_CLIENT_H_
 #define CC_TEST_STUB_LAYER_TREE_HOST_CLIENT_H_
 
 #include "cc/trees/layer_tree_host_client.h"
 
 namespace cc {
 
 class StubLayerTreeHostClient : public LayerTreeHostClient {
  public:
   ~StubLayerTreeHostClient() override;
 
   // LayerTreeHostClient implementation.
   void WillBeginMainFrame() override {}
   void DidBeginMainFrame() override {}
   void BeginMainFrame(const 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 {}
 };
 
 }  // namespace cc
 
 #endif  // CC_TEST_STUB_LAYER_TREE_HOST_CLIENT_H_