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 9a451590f98099a37a86afb20d4c47b29fb4015c..994b4f1460c15bcb2471667cb512203e0d54b209 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 input while focus was on the
+  // page. This is used to inform the delegate that a user is interacting with
+  // a site.
+  virtual void OnUserInput(const blink::WebInputEvent::Type type) {}
+
   // 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.