The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/1b47fda711331d9d39563ce0749c5f515b186169

commit 1b47fda711331d9d39563ce0749c5f515b186169
Author: sahel <sahel@chromium.org>
Date: Tue Mar 28 17:03:07 2017

UMA metrics for use count of wheel and touch scrolls.

For Impl thread scrolling test, run the virtual threaded/fast/scroll-behavior
testSuite.

BUG= 699272 
TEST=LayoutTests/fast/scroll-behavior/wheel-and-touch-scroll-use-count.html
CQ_INCLUDE_TRYBOTS=master.tryserver.blink:linux_trusty_blink_rel

Review-Url: https://codereview.chromium.org/2737653004
Cr-Commit-Position: refs/heads/master@{#460140}

[modify] https://crrev.com/1b47fda711331d9d39563ce0749c5f515b186169/cc/test/layer_tree_test.cc
[modify] https://crrev.com/1b47fda711331d9d39563ce0749c5f515b186169/cc/test/stub_layer_tree_host_client.h
[modify] https://crrev.com/1b47fda711331d9d39563ce0749c5f515b186169/cc/trees/layer_tree_host.cc
[modify] https://crrev.com/1b47fda711331d9d39563ce0749c5f515b186169/cc/trees/layer_tree_host.h
[modify] https://crrev.com/1b47fda711331d9d39563ce0749c5f515b186169/cc/trees/layer_tree_host_client.h
[modify] https://crrev.com/1b47fda711331d9d39563ce0749c5f515b186169/cc/trees/layer_tree_host_common.cc
[modify] https://crrev.com/1b47fda711331d9d39563ce0749c5f515b186169/cc/trees/layer_tree_host_common.h
[modify] https://crrev.com/1b47fda711331d9d39563ce0749c5f515b186169/cc/trees/layer_tree_host_impl.cc
[modify] https://crrev.com/1b47fda711331d9d39563ce0749c5f515b186169/cc/trees/layer_tree_host_impl.h
[modify] https://crrev.com/1b47fda711331d9d39563ce0749c5f515b186169/content/browser/renderer_host/compositor_impl_android.h
[modify] https://crrev.com/1b47fda711331d9d39563ce0749c5f515b186169/content/renderer/gpu/render_widget_compositor.cc
[modify] https://crrev.com/1b47fda711331d9d39563ce0749c5f515b186169/content/renderer/gpu/render_widget_compositor.h
[modify] https://crrev.com/1b47fda711331d9d39563ce0749c5f515b186169/content/renderer/gpu/render_widget_compositor_delegate.h
[modify] https://crrev.com/1b47fda711331d9d39563ce0749c5f515b186169/content/renderer/gpu/render_widget_compositor_unittest.cc
[modify] https://crrev.com/1b47fda711331d9d39563ce0749c5f515b186169/content/renderer/render_widget.cc
[modify] https://crrev.com/1b47fda711331d9d39563ce0749c5f515b186169/content/renderer/render_widget.h
[add] https://crrev.com/1b47fda711331d9d39563ce0749c5f515b186169/third_party/WebKit/LayoutTests/fast/scroll-behavior/wheel-and-touch-scroll-use-count.html
[modify] https://crrev.com/1b47fda711331d9d39563ce0749c5f515b186169/third_party/WebKit/Source/core/input/ScrollManager.cpp
[modify] https://crrev.com/1b47fda711331d9d39563ce0749c5f515b186169/third_party/WebKit/Source/platform/testing/WebLayerTreeViewImplForTesting.cpp
[modify] https://crrev.com/1b47fda711331d9d39563ce0749c5f515b186169/third_party/WebKit/Source/platform/testing/WebLayerTreeViewImplForTesting.h
[modify] https://crrev.com/1b47fda711331d9d39563ce0749c5f515b186169/third_party/WebKit/Source/web/WebViewFrameWidget.cpp
[modify] https://crrev.com/1b47fda711331d9d39563ce0749c5f515b186169/third_party/WebKit/Source/web/WebViewFrameWidget.h
[modify] https://crrev.com/1b47fda711331d9d39563ce0749c5f515b186169/third_party/WebKit/Source/web/WebViewImpl.cpp
[modify] https://crrev.com/1b47fda711331d9d39563ce0749c5f515b186169/third_party/WebKit/Source/web/WebViewImpl.h
[modify] https://crrev.com/1b47fda711331d9d39563ce0749c5f515b186169/third_party/WebKit/public/web/WebWidget.h
[modify] https://crrev.com/1b47fda711331d9d39563ce0749c5f515b186169/ui/compositor/compositor.h