[cros] Cache the URL of user's G+ profile photo to prevent redundant downloads.

chrome/browser/chromeos/login/user.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_CHROMEOS_LOGIN_USER_H_
 #define CHROME_BROWSER_CHROMEOS_LOGIN_USER_H_
 #pragma once
 
 #include <string>
 #include <vector>
@@ skipping 56 matching lines @@
   // Returns raw representation of static user image.
   const UserImage::RawImage& raw_image() const {
     return user_image_.raw_image();
   }
   bool has_animated_image() const { return user_image_.has_animated_image(); }
   // Returns raw representation of animated user image.
   const UserImage::RawImage& animated_image() const {
     return user_image_.animated_image();
   }
 
+  // Returns the URL of user image, if there is any. Currently only the profile
+  // image has a URL, for other images empty URL is returned.
+  GURL image_url() const { return user_image_.url(); }
+
   // The thumbnail of user custom wallpaper.
   const SkBitmap& wallpaper_thumbnail() const { return wallpaper_thumbnail_; }
 
   // True if user image is a stub (while real image is being loaded from file).
   bool image_is_stub() const { return image_is_stub_; }
 
   // OAuth token status for this user.
   OAuthTokenStatus oauth_token_status() const { return oauth_token_status_; }
 
   // The displayed user name.
@@ skipping 10 matching lines @@
   friend class MockUserManager;
   friend class UserManagerTest;
 
   // Do not allow anyone else to create new User instances.
   User(const std::string& email, bool is_guest);
   ~User();
 
   // Setters are private so only UserManager can call them.
   void SetImage(const UserImage& user_image, int image_index);
 
+  void SetImageURL(const GURL& image_url);
+
   // Sets a stub image until the next |SetImage| call. |image_index| may be
   // one of |kExternalImageIndex| or |kProfileImageIndex|.
   void SetStubImage(int image_index);
 
   // Set thumbnail of user custom wallpaper.
   void SetWallpaperThumbnail(const SkBitmap& wallpaper_thumbnail);
 
   void set_oauth_token_status(OAuthTokenStatus status) {
     oauth_token_status_ = status;
   }
@@ skipping 29 matching lines @@
 
   DISALLOW_COPY_AND_ASSIGN(User);
 };
 
 // List of known users.
 typedef std::vector<User*> UserList;
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_LOGIN_USER_H_