If user profile doesn't contain language setting, default to his Google account settings.

chrome/browser/profiles/profile.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.
 
 // This class gathers state related to a single user profile.
 
 #ifndef CHROME_BROWSER_PROFILES_PROFILE_H_
 #define CHROME_BROWSER_PROFILES_PROFILE_H_
 
 #include <string>
@@ skipping 275 matching lines @@
     // From login screen.
     APP_LOCALE_CHANGED_VIA_LOGIN,
     // Source unknown.
     APP_LOCALE_CHANGED_VIA_UNKNOWN
   };
 
   // Changes application locale for a profile.
   virtual void ChangeAppLocale(
       const std::string& locale, AppLocaleChangedVia via) = 0;
 
+  // Mark profile creation complete (i.e. initial load complete).
+  virtual void MarkCreated() = 0;
+
   // Called after login.
   virtual void OnLogin() = 0;
 
   // Creates ChromeOS's EnterpriseExtensionListener.
   virtual void SetupChromeOSEnterpriseExtensionObserver() = 0;
 
   // Initializes Chrome OS's preferences.
   virtual void InitChromeOSPreferences() = 0;
+
+  // Select "best match" locale.
+  virtual void RespectLocalePreference() = 0;
+
+  // Sets locale to G+ if use preferences are not loaded.
+  virtual void SetGPlusProfileLocale(const std::string& gplus_locale) = 0;
 #endif  // defined(OS_CHROMEOS)
 
   // Returns the helper object that provides the proxy configuration service
   // access to the the proxy configuration possibly defined by preferences.
   virtual PrefProxyConfigTracker* GetProxyConfigTracker() = 0;
 
   // Returns the Predictor object used for dns prefetch.
   virtual chrome_browser_net::Predictor* GetNetworkPredictor() = 0;
 
   // Deletes all network related data since |time|. It deletes transport
@@ skipping 93 matching lines @@
 struct hash<Profile*> {
   std::size_t operator()(Profile* const& p) const {
     return reinterpret_cast<std::size_t>(p);
   }
 };
 
 }  // namespace BASE_HASH_NAMESPACE
 #endif
 
 #endif  // CHROME_BROWSER_PROFILES_PROFILE_H_