Add histograms for network activity, and total/cumulative

chrome/browser/net/chrome_network_delegate.h

Index: chrome/browser/net/chrome_network_delegate.h
===================================================================
--- chrome/browser/net/chrome_network_delegate.h	(revision 150909)
+++ chrome/browser/net/chrome_network_delegate.h	(working copy)
@@ -18,7 +18,7 @@
 typedef PrefMember<bool> BooleanPrefMember;
 
 namespace chrome_browser_net {
-class CacheStats;
+class LoadTimeStats;
 }
 
 namespace extensions {
@@ -46,7 +46,7 @@
       void* profile,
       CookieSettings* cookie_settings,
       BooleanPrefMember* enable_referrers,
-      chrome_browser_net::CacheStats* cache_stats);
+      chrome_browser_net::LoadTimeStats* load_time_stats);
   virtual ~ChromeNetworkDelegate();
 
   // Causes |OnCanThrottleRequest| to never return true.
@@ -103,8 +103,8 @@
   virtual int OnBeforeSocketStreamConnect(
       net::SocketStream* stream,
       const net::CompletionCallback& callback) OVERRIDE;
-  virtual void OnCacheWaitStateChange(const net::URLRequest& request,
-                                      CacheWaitState state) OVERRIDE;
+  virtual void OnRequestWaitStateChange(const net::URLRequest& request,
+                                        RequestWaitState state) OVERRIDE;
 
   scoped_refptr<extensions::EventRouterForwarder> event_router_;
   void* profile_;
@@ -125,7 +125,7 @@
   static bool g_allow_file_access_;
 
   // Pointer to IOThread global, should outlive ChromeNetworkDelegate.
-  chrome_browser_net::CacheStats* cache_stats_;
+  chrome_browser_net::LoadTimeStats* load_time_stats_;
 
   DISALLOW_COPY_AND_ASSIGN(ChromeNetworkDelegate);
 };