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

chrome/browser/profiles/profile_downloader.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 CHROME_BROWSER_PROFILES_PROFILE_DOWNLOADER_H_
 #define CHROME_BROWSER_PROFILES_PROFILE_DOWNLOADER_H_
 
 #include <string>
 
 #include "base/basictypes.h"
@@ skipping 32 matching lines @@
 
   // Starts downloading profile information if the necessary authorization token
   // is ready. If not, subscribes to token service and starts fetching if the
   // token is available. Should not be called more than once.
   virtual void Start();
 
   // On successful download this returns the full name of the user. For example
   // "Pat Smith".
   virtual string16 GetProfileFullName() const;
 
+  // On successful download this returns G+ locale preference of the user.
+  virtual std::string GetProfileLocale() const;
+
   // On successful download this returns the profile picture of the user.
   // For users with no profile picture set (that is, they have the default
   // profile picture) this will return an Null bitmap.
   virtual SkBitmap GetProfilePicture() const;
 
   // Gets the profile picture status.
   virtual PictureStatus GetProfilePictureStatus() const;
 
   // Gets the URL for the profile picture. This can be cached so that the same
   // picture is not downloaded multiple times. This value should only be used
@@ skipping 16 matching lines @@
   // Overriden from OAuth2TokenService::Observer:
   virtual void OnRefreshTokenAvailable(const std::string& account_id) OVERRIDE;
 
   // Overriden from OAuth2TokenService::Consumer:
   virtual void OnGetTokenSuccess(const OAuth2TokenService::Request* request,
                                  const std::string& access_token,
                                  const base::Time& expiration_time) OVERRIDE;
   virtual void OnGetTokenFailure(const OAuth2TokenService::Request* request,
                                  const GoogleServiceAuthError& error) OVERRIDE;
 
-  // Parses the entry response and gets the name and and profile image URL.
+  // Parses the entry response and gets the name, profile image URL and locale.
   // |data| should be the JSON formatted data return by the response.
   // Returns false to indicate a parsing error.
-  static bool GetProfileNameAndImageURL(const std::string& data,
-                                        string16* nick_name,
-                                        std::string* url,
-                                        int image_size);
-
+  static bool ParseProfileJSON(const std::string& data,
+                               string16* nick_name,
+                               std::string* url,
+                               int image_size,
+                               std::string* profile_locale);
   // Returns true if the image url is url of the default profile picture.
   static bool IsDefaultProfileImageURL(const std::string& url);
 
   // Issues the first request to get user profile image.
   void StartFetchingImage();
 
   // Gets the authorization header.
   const char* GetAuthorizationHeader() const;
 
   // Starts fetching OAuth2 access token. This is needed before the GAIA info
   // can be downloaded.
   void StartFetchingOAuth2AccessToken();
 
   ProfileDownloaderDelegate* delegate_;
   std::string auth_token_;
   scoped_ptr<net::URLFetcher> user_entry_fetcher_;
   scoped_ptr<net::URLFetcher> profile_image_fetcher_;
   scoped_ptr<OAuth2TokenService::Request> oauth2_access_token_request_;
   string16 profile_full_name_;
+  std::string profile_locale_;
   SkBitmap profile_picture_;
   PictureStatus picture_status_;
   std::string picture_url_;
 
   DISALLOW_COPY_AND_ASSIGN(ProfileDownloader);
 };
 
 #endif  // CHROME_BROWSER_PROFILES_PROFILE_DOWNLOADER_H_