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

chrome/common/render_messages_internal.h

Index: chrome/common/render_messages_internal.h
===================================================================
--- chrome/common/render_messages_internal.h	(revision 17638)
+++ chrome/common/render_messages_internal.h	(working copy)
@@ -1397,6 +1397,15 @@
   IPC_MESSAGE_ROUTED1(ViewHostMsg_AccessibilityFocusChange,
                       int /* accessibility object id */)
 
+  // Message sent from the renderer to the browser to request that the browser
+  // close all idle sockets.  Used for debugging/testing.
+  IPC_MESSAGE_CONTROL0(ViewHostMsg_CloseIdleConnections)
+
+  // Message sent from the renderer to the browser to request that the browser
+  // close all idle sockets.  Used for debugging/testing.
+  IPC_MESSAGE_CONTROL1(ViewHostMsg_SetCacheMode,
+                       bool /* enabled */)
+
   //---------------------------------------------------------------------------
   // Utility process host messages:
   // These are messages from the utility process to the browser.  They're here
@@ -1414,4 +1423,5 @@
   // |error_message| is a user-displayable explanation of what went wrong.
   IPC_MESSAGE_CONTROL1(UtilityHostMsg_UnpackExtension_Failed,
                        std::string /* error_message, if any */)
+
 IPC_END_MESSAGES(ViewHost)