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 3489495b7ac597a6e5bd785e8b7144d8eb3894e6..f250f32517a8a3f81a7e34c079577e1c4c9f2323 100644
--- a/content/browser/renderer_host/render_widget_host_impl.h
+++ b/content/browser/renderer_host/render_widget_host_impl.h
@@ -494,6 +494,11 @@ class CONTENT_EXPORT RenderWidgetHostImpl
   // event and 2) enter or space key presses.
   virtual void OnUserGesture() {}
 
+  // Notification that the user has made some kind of direct input with the
+  // page. Direct input includes 1) any mouse down event; 2) any mouse wheel
+  // event; 3) any raw key down event; and 4) any gesture tap event.
+  virtual void OnUserInput(const blink::WebInputEvent::Type type) {}
+
   // Callbacks for notification when the renderer becomes unresponsive to user
   // input events, and subsequently responsive again.
   virtual void NotifyRendererUnresponsive() {}