Adding histograms showing fraction of page load times

chrome/browser/net/chrome_network_delegate.h

Index: chrome/browser/net/chrome_network_delegate.h
===================================================================
--- chrome/browser/net/chrome_network_delegate.h	(revision 147972)
+++ chrome/browser/net/chrome_network_delegate.h	(working copy)
@@ -18,6 +18,10 @@
 
 typedef PrefMember<bool> BooleanPrefMember;
 
+namespace chrome_browser_net {
+class CacheStats;
+}
+
 namespace policy {
 class URLBlacklistManager;
 }
@@ -95,6 +99,8 @@
   virtual int OnBeforeSocketStreamConnect(
       net::SocketStream* stream,
       const net::CompletionCallback& callback) OVERRIDE;
+  virtual void OnCacheWaitStateChange(const net::URLRequest& request,
+                                      CacheWaitState state) OVERRIDE;
 
   scoped_refptr<ExtensionEventRouterForwarder> event_router_;
   void* profile_;
@@ -114,6 +120,8 @@
   // When true, allow access to all file:// URLs.
   static bool g_allow_file_access_;
 
+  chrome_browser_net::CacheStats* cache_stats_;
+
   DISALLOW_COPY_AND_ASSIGN(ChromeNetworkDelegate);
 };