Add prefetch UMA metrics.

net/url_request/test_url_fetcher_factory.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef NET_URL_REQUEST_TEST_URL_FETCHER_FACTORY_H_
 #define NET_URL_REQUEST_TEST_URL_FETCHER_FACTORY_H_
 
+#include <stdint.h>
+
 #include <list>
 #include <map>
 #include <string>
 #include <utility>
 
 #include "base/basictypes.h"
 #include "base/callback.h"
 #include "base/compiler_specific.h"
 #include "base/files/file_path.h"
 #include "base/memory/scoped_ptr.h"
@@ skipping 283 matching lines @@
 
   const GURL& GetURL() const override;
 
   ~FakeURLFetcher() override;
 
  private:
   // This is the method which actually calls the delegate that is passed in the
   // constructor.
   void RunDelegate();
 
+  int64_t response_bytes_;
   base::WeakPtrFactory<FakeURLFetcher> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(FakeURLFetcher);
 };
 
 
 // FakeURLFetcherFactory is a factory for FakeURLFetcher objects. When
 // instantiated, it sets itself up as the default URLFetcherFactory. Fake
 // responses for given URLs can be set using SetFakeResponse.
 //
@@ skipping 134 matching lines @@
   // This method will create a real URLFetcher.
   scoped_ptr<URLFetcher> CreateURLFetcher(int id,
                                           const GURL& url,
                                           URLFetcher::RequestType request_type,
                                           URLFetcherDelegate* d) override;
 };
 
 }  // namespace net
 
 #endif  // NET_URL_REQUEST_TEST_URL_FETCHER_FACTORY_H_