Schedule idle timer of render thread when user is idle.

chrome/renderer/chrome_content_renderer_client.cc

Index: chrome/renderer/chrome_content_renderer_client.cc
diff --git a/chrome/renderer/chrome_content_renderer_client.cc b/chrome/renderer/chrome_content_renderer_client.cc
index a13506c2d5beb6c844e5ec9016e3ea9d6ae34b35..cfbbedb58c47aab6b5963d6832ede4f98e52b7a9 100644
--- a/chrome/renderer/chrome_content_renderer_client.cc
+++ b/chrome/renderer/chrome_content_renderer_client.cc
@@ -594,6 +594,10 @@ bool ChromeContentRendererClient::RunIdleHandlerWhenWidgetsHidden() {
   return !extension_dispatcher_->is_extension_process();
 }
 
+bool ChromeContentRendererClient::RunIdleHandlerWhenUserIdle() {
+  return !extension_dispatcher_->is_extension_process();
+}
+
 bool ChromeContentRendererClient::AllowPopup(const GURL& creator) {
   ChromeV8Context* current_context =
       extension_dispatcher_->v8_context_set().GetCurrent();