Notify WebContentsObservers of user interactions.

content/browser/renderer_host/render_view_host_delegate.h

Index: content/browser/renderer_host/render_view_host_delegate.h
diff --git a/content/browser/renderer_host/render_view_host_delegate.h b/content/browser/renderer_host/render_view_host_delegate.h
index 880589292c94fb996b476284bfa2b1fc6d230bab..ecfc7527baff9829abcb1ee127501f1f52e37eb9 100644
--- a/content/browser/renderer_host/render_view_host_delegate.h
+++ b/content/browser/renderer_host/render_view_host_delegate.h
@@ -15,6 +15,7 @@
 #include "content/common/content_export.h"
 #include "net/base/load_states.h"
 #include "third_party/WebKit/public/platform/WebDisplayMode.h"
+#include "third_party/WebKit/public/web/WebInputEvent.h"
 #include "third_party/WebKit/public/web/WebPopupType.h"
 #include "ui/base/window_open_disposition.h"
 
@@ -140,6 +141,11 @@ class CONTENT_EXPORT RenderViewHostDelegate {
   // bombing), see DownloadRequestLimiter for details.
   virtual void OnUserGesture() {}
 
+  // Notification the user has performed a direct interaction while focus was on
+  // the page. This is used to inform the delegate that a user is interacting
+  // with a site.
+  virtual void OnUserInteraction(const blink::WebInputEvent::Type type) {}

[nasko, 2015/10/27 13:41:19]

The RenderViewHost object is deprecated and actively being disentangled from
RenderWidgetHost and hopefully will disappear not too far in the future. Please
move this over to the RenderWidgetHostDelegate, which is the equivalent of this
and still gets up to WebContents. It will also avoid the top through RVH, which
isn't necessary anyway.

[dominickn, 2015/10/27 23:21:53]

Done.

+
   // Notification from the renderer host that blocked UI event occurred.
   // This happens when there are tab-modal dialogs. In this case, the
   // notification is needed to let us draw attention to the dialog (i.e.