Adding histograms showing fraction of page load times

net/url_request/url_request_http_job.h

Index: net/url_request/url_request_http_job.h
===================================================================
--- net/url_request/url_request_http_job.h	(revision 148459)
+++ net/url_request/url_request_http_job.h	(working copy)
@@ -142,6 +142,7 @@
   typedef base::RefCountedData<bool> SharedBoolean;
 
   class HttpFilterContext;
+  class HttpTransactionDelegateImpl;
 
   virtual ~URLRequestHttpJob();
 
@@ -187,6 +188,9 @@
   // overridden by |override_response_headers_|.
   HttpResponseHeaders* GetResponseHeaders() const;
 
+  // Override of the private interface of URLRequestJob.
+  virtual void OnDetachRequest() OVERRIDE;
+
   base::Time request_creation_time_;
 
   // Data used for statistics gathering. This data is only used for histograms
@@ -234,6 +238,8 @@
   // to inform the NetworkDelegate that it may not call back.
   bool awaiting_callback_;
 
+  scoped_ptr<HttpTransactionDelegateImpl> http_transaction_delegate_;
+
   DISALLOW_COPY_AND_ASSIGN(URLRequestHttpJob);
 };