[cros] Update wallpaper when displaying Gaia frame.

chrome/browser/ui/webui/chromeos/login/signin_screen_handler.h

Index: chrome/browser/ui/webui/chromeos/login/signin_screen_handler.h
diff --git a/chrome/browser/ui/webui/chromeos/login/signin_screen_handler.h b/chrome/browser/ui/webui/chromeos/login/signin_screen_handler.h
index 146403422782640baece18d53e01b506e823da98..07220db6a3ffd3ebe812aeafe2c04b65794903a8 100644
--- a/chrome/browser/ui/webui/chromeos/login/signin_screen_handler.h
+++ b/chrome/browser/ui/webui/chromeos/login/signin_screen_handler.h
@@ -78,12 +78,11 @@ class SigninScreenHandlerDelegate {
   // Create a new Google account.
   virtual void CreateAccount() = 0;
 
-  // Called user pod selection is canceled.
-  virtual void OnUserDeselected() = 0;
+  // Load wallpaper for given |username|.
+  virtual void LoadWallpaper(const std::string& username) = 0;
 
-  // Called when user pod with |username| is selected at login screen.
-  // |username| is the email address of the selected user.
-  virtual void OnUserSelected(const std::string& username) = 0;
+  // Loads the default sign-in wallpaper.
+  virtual void LoadSigninWallpaper() = 0;
 
   // Attempts to remove given user.
   virtual void RemoveUser(const std::string& username) = 0;
@@ -214,8 +213,7 @@ class SigninScreenHandler
   void HandleLaunchIncognito(const base::ListValue* args);
   void HandleOfflineLogin(const base::ListValue* args);
   void HandleShutdownSystem(const base::ListValue* args);
-  void HandleUserDeselected(const base::ListValue* args);
-  void HandleUserSelected(const base::ListValue* args);
+  void HandleLoadWallpaper(const base::ListValue* args);
   void HandleRemoveUser(const base::ListValue* args);
   void HandleShowAddUser(const base::ListValue* args);
   void HandleToggleEnrollmentScreen(const base::ListValue* args);