Asynchronously load wallpapers when user pod is selected.

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 98382a71deaaf2fcaeefff7cf19d68f925f0d21c..8de4977775b99fabe373b633c143f71087386a3b 100644
--- a/chrome/browser/ui/webui/chromeos/login/signin_screen_handler.h
+++ b/chrome/browser/ui/webui/chromeos/login/signin_screen_handler.h
@@ -76,6 +76,10 @@ class SigninScreenHandlerDelegate {
   // Create a new Google account.
   virtual void CreateAccount() = 0;
 
+  // Called when user pod with |username| is selected at login screen.
+  // |username| is the email address of the selected user.
+  virtual void UserSelected(const std::string& username) = 0;
+
   // Attempts to remove given user.
   virtual void RemoveUser(const std::string& username) = 0;
 
@@ -188,6 +192,7 @@ class SigninScreenHandler : public BaseScreenHandler,
   void HandleHideCaptivePortal(const base::ListValue* args);
   void HandleOfflineLogin(const base::ListValue* args);
   void HandleShutdownSystem(const base::ListValue* args);
+  void HandleUserSelected(const base::ListValue* args);
   void HandleRemoveUser(const base::ListValue* args);
   void HandleShowAddUser(const base::ListValue* args);
   void HandleToggleEnrollmentScreen(const base::ListValue* args);