Notify WebContentsObservers of user interactions.

content/browser/renderer_host/render_widget_host_impl.h

Index: content/browser/renderer_host/render_widget_host_impl.h
diff --git a/content/browser/renderer_host/render_widget_host_impl.h b/content/browser/renderer_host/render_widget_host_impl.h
index bd6bc767fc252f6b9acf9d617dd9154aa94a1471..226d06f573363fc542cd2f0b18b40441ffabb65f 100644
--- a/content/browser/renderer_host/render_widget_host_impl.h
+++ b/content/browser/renderer_host/render_widget_host_impl.h
@@ -578,6 +578,11 @@ class CONTENT_EXPORT RenderWidgetHostImpl : public RenderWidgetHost,
   // NotifyRendererResponsive.
   void RendererIsResponsive();
 
+  // Notification that the user has made some kind of direct input with the
+  // page. Direct input includes 1) any mouse down event; 2) any raw key down
+  // event; and 3) any gesture tap event (which includes taps and scrolls).
+  virtual void OnUserInteraction(const blink::WebInputEvent::Type type);
+
   // Routines used to send the RenderWidget its screen color profile.
   void DispatchColorProfile();
   void SendColorProfile();