[Offline Pages] Adds Rappor metrics measuring what domains are saved & viewed.

chrome/browser/android/offline_pages/test_offline_page_model_builder.cc

 // Copyright 2015 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.
 
 #include "chrome/browser/android/offline_pages/test_offline_page_model_builder.h"
 
 #include <utility>
 
 #include "base/memory/ref_counted.h"
+#include "base/memory/weak_ptr.h"
 #include "base/single_thread_task_runner.h"
 #include "base/thread_task_runner_handle.h"
 #include "chrome/common/chrome_constants.h"
 #include "components/offline_pages/offline_page_model.h"
 #include "components/offline_pages/offline_page_test_store.h"
 #include "content/public/browser/browser_context.h"
 
+namespace rappor {
+class RapporService;

[fgorski, 2016/05/13 17:49:17]

this is a .cc file. Why do you forward declare this thing?

+}
+
 namespace offline_pages {
 
 std::unique_ptr<KeyedService> BuildTestOfflinePageModel(
     content::BrowserContext* context) {
   scoped_refptr<base::SingleThreadTaskRunner> task_runner =
       base::ThreadTaskRunnerHandle::Get();
 
   std::unique_ptr<OfflinePageTestStore> metadata_store(
       new OfflinePageTestStore(task_runner));
 
   base::FilePath archives_dir =
       context->GetPath().Append(chrome::kOfflinePageArchviesDirname);
 
   return std::unique_ptr<KeyedService>(new OfflinePageModel(
-      std::move(metadata_store), archives_dir, task_runner));
+      std::move(metadata_store), archives_dir,
+      base::WeakPtr<rappor::RapporService>(), task_runner));
 }
 
 }  // namespace offline_pages