UMA metrics for use count of wheel and touch scrolls.

content/renderer/gpu/render_widget_compositor_unittest.cc

Index: content/renderer/gpu/render_widget_compositor_unittest.cc
diff --git a/content/renderer/gpu/render_widget_compositor_unittest.cc b/content/renderer/gpu/render_widget_compositor_unittest.cc
index eb6de06cd1be13ccf1b6a3a6313e6a0cd42d61fd..e04ffff0f62367cc977ba78f1bd70d102022fc74 100644
--- a/content/renderer/gpu/render_widget_compositor_unittest.cc
+++ b/content/renderer/gpu/render_widget_compositor_unittest.cc
@@ -42,6 +42,8 @@ class StubRenderWidgetCompositorDelegate
                            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 BeginMainFrame(double frame_time_sec) override {}
   void RequestNewCompositorFrameSink(
       bool fallback,