Implemented ForceMaximizeBrowserWindowOnFirstRun policy, added unit test and browser test.

chrome/browser/prefs/browser_prefs.cc

 // Copyright 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.
 
 #include "chrome/browser/prefs/browser_prefs.h"
 
 #include <string>
 
 #include "base/metrics/histogram.h"
 #include "base/prefs/pref_registry_simple.h"
@@ skipping 492 matching lines @@
   chromeos::file_system_provider::RegisterProfilePrefs(registry);
   chromeos::MultiProfileUserController::RegisterProfilePrefs(registry);
   chromeos::Preferences::RegisterProfilePrefs(registry);
   chromeos::proxy_config::RegisterProfilePrefs(registry);
   chromeos::SAMLOfflineSigninLimiter::RegisterProfilePrefs(registry);
   chromeos::ServicesCustomizationDocument::RegisterProfilePrefs(registry);
   chromeos::UserImageSyncObserver::RegisterProfilePrefs(registry);
   extensions::EnterprisePlatformKeysPrivateChallengeUserKeyFunction::
       RegisterProfilePrefs(registry);
   FlagsUI::RegisterProfilePrefs(registry);
+

[bartfab (slow), 2015/03/12 11:54:47]

Nit: Remove the blank line.

[peletskyi, 2015/03/18 13:28:13]

Done.

+  registry->RegisterBooleanPref(

[bartfab (slow), 2015/03/12 11:54:47]

Please move this to chromeos::Preferences::RegisterProfilePrefs(). There is no
precedent for registering specific preferences here. It is always delegsted to
helper methods.

[peletskyi, 2015/03/18 13:28:13]

Done.

+      prefs::kForceMaximizeBrowserWindowOnFirstRun, false,
+      user_prefs::PrefRegistrySyncable::UNSYNCABLE_PREF);
 #endif
 
 #if defined(OS_WIN)
   component_updater::RegisterProfilePrefsForSwReporter(registry);
   NetworkProfileBubble::RegisterProfilePrefs(registry);
 #endif
 
 #if defined(TOOLKIT_VIEWS)
   RegisterBrowserViewProfilePrefs(registry);
   RegisterInvertBubbleUserPrefs(registry);
@@ skipping 159 matching lines @@
       host_zoom_dictionary, false /* sanitize_partition_host_zoom_levels */);
 
   // We're done migrating the profile per-host zoom level values, so we clear
   // them all.
   DictionaryPrefUpdate host_zoom_dictionary_update(
       prefs, prefs::kPerHostZoomLevelsDeprecated);
   host_zoom_dictionary_update->Clear();
 }
 
 }  // namespace chrome