Adding histograms showing fraction of page load times

chrome/browser/profiles/profile_io_data.h

Index: chrome/browser/profiles/profile_io_data.h
===================================================================
--- chrome/browser/profiles/profile_io_data.h	(revision 148459)
+++ chrome/browser/profiles/profile_io_data.h	(working copy)
@@ -30,6 +30,7 @@
 class TransportSecurityPersister;
 
 namespace chrome_browser_net {
+class CacheStats;
 class HttpServerPropertiesManager;
 class ResourcePrefetchPredictorObserver;
 }
@@ -132,7 +133,7 @@
  protected:
   class AppRequestContext : public ChromeURLRequestContext {
    public:
-    AppRequestContext();
+    explicit AppRequestContext(chrome_browser_net::CacheStats* cache_stats);
 
     void SetCookieStore(net::CookieStore* cookie_store);
     void SetHttpTransactionFactory(net::HttpTransactionFactory* http_factory);
@@ -235,6 +236,10 @@
     return main_request_context_.get();
   }
 
+  chrome_browser_net::CacheStats* cache_stats() const {
+    return cache_stats_;
+  }
+
   // Destroys the ResourceContext first, to cancel any URLRequests that are
   // using it still, before we destroy the member variables that those
   // URLRequests may be accessing.
@@ -264,6 +269,11 @@
   typedef base::hash_map<std::string, ChromeURLRequestContext*>
       AppRequestContextMap;
 
+  // Returns the CacheStats object to be used for this profile
+  // (may be NULL for OTR profiles).
+  virtual chrome_browser_net::CacheStats* GetCacheStats(

[willchan no longer on Chromium, 2012/07/26 20:03:38]

Can you move this to the virtual interface section below? And make it pure like
all the other virtuals to be consistent.

[tburkard, 2012/07/26 20:52:31]

Done.

+      IOThread* io_thread) const;
+
   // --------------------------------------------
   // Virtual interface for subtypes to implement:
   // --------------------------------------------
@@ -359,6 +369,8 @@
   mutable scoped_ptr<chrome_browser_net::ResourcePrefetchPredictorObserver>
       resource_prefetch_predictor_observer_;
 
+  mutable chrome_browser_net::CacheStats* cache_stats_;
+
   // TODO(jhawkins): Remove once crbug.com/102004 is fixed.
   bool initialized_on_UI_thread_;