UMA metrics for use count of wheel and touch scrolls.

content/renderer/gpu/render_widget_compositor.cc

Index: content/renderer/gpu/render_widget_compositor.cc
diff --git a/content/renderer/gpu/render_widget_compositor.cc b/content/renderer/gpu/render_widget_compositor.cc
index c54182c518e91c7e4310151538ee6577e78bc120..a979355493f5fcb07eacf0d42c61c182ba783da9 100644
--- a/content/renderer/gpu/render_widget_compositor.cc
+++ b/content/renderer/gpu/render_widget_compositor.cc
@@ -1062,6 +1062,13 @@ void RenderWidgetCompositor::ApplyViewportDeltas(
                                  top_controls_delta);
 }
 
+void RenderWidgetCompositor::RecordWheelAndTouchScrollingCount(
+    bool has_scrolled_by_wheel,
+    bool has_scrolled_by_touch) {
+  delegate_->RecordWheelAndTouchScrollingCount(has_scrolled_by_wheel,
+                                               has_scrolled_by_touch);
+}
+
 void RenderWidgetCompositor::RequestNewCompositorFrameSink() {
   // If the host is closing, then no more compositing is possible.  This
   // prevents shutdown races between handling the close message and