Add an extension to expose some primitives to JS for doing ...

chrome/browser/renderer_host/resource_message_filter.h

Index: chrome/browser/renderer_host/resource_message_filter.h
===================================================================
--- chrome/browser/renderer_host/resource_message_filter.h	(revision 17638)
+++ chrome/browser/renderer_host/resource_message_filter.h	(working copy)
@@ -211,6 +211,9 @@
   void OnOpenChannelToExtension(int routing_id,
                                 const std::string& extension_id, int* port_id);
 
+  void OnCloseIdleConnections();
+  void OnSetCacheMode(bool enabled);
+
 #if defined(OS_LINUX)
   void SendDelayedReply(IPC::Message* reply_msg);
   void DoOnGetScreenInfo(gfx::NativeViewId view, IPC::Message* reply_msg);
@@ -223,6 +226,8 @@
   void DoOnClipboardReadHTML(IPC::Message* reply_msg);
 #endif
 
+  bool CheckBenchmarkingEnabled();
+
   // We have our own clipboard because we want to access the clipboard on the
   // IO thread instead of forwarding (possibly synchronous) messages to the UI
   // thread. This instance of the clipboard should be accessed only on the IO