Schedule idle timer of render thread when user is idle.

content/public/renderer/content_renderer_client.h

Index: content/public/renderer/content_renderer_client.h
diff --git a/content/public/renderer/content_renderer_client.h b/content/public/renderer/content_renderer_client.h
index ff45b1ee435f4352d0aff3365e4a1fe432e87a8d..7bab5bb1df5f3d1b9af0c8d229ce09e7148ed595 100644
--- a/content/public/renderer/content_renderer_client.h
+++ b/content/public/renderer/content_renderer_client.h
@@ -93,6 +93,10 @@ class ContentRendererClient {
   // all widgets are hidden.
   virtual bool RunIdleHandlerWhenWidgetsHidden() = 0;
 
+  // Returns true if the renderer process should schedule the idle handler when
+  // the user is idle.
+  virtual bool RunIdleHandlerWhenUserIdle() = 0;
+
   // Returns true if the given url can create popup windows.
   virtual bool AllowPopup(const GURL& creator) = 0;