Asynchronously load wallpapers when user pod is selected.

chrome/browser/chromeos/login/user_manager.h

Index: chrome/browser/chromeos/login/user_manager.h
diff --git a/chrome/browser/chromeos/login/user_manager.h b/chrome/browser/chromeos/login/user_manager.h
index 1aeca8e10bf43909fb3eef3ae55021ca1bd2f6e8..a58c7a9160b163b6730363b503538dbb97e838d0 100644
--- a/chrome/browser/chromeos/login/user_manager.h
+++ b/chrome/browser/chromeos/login/user_manager.h
@@ -95,6 +95,9 @@ class UserManager {
   // Indicates that a user just logged in as ephemeral.
   virtual void EphemeralUserLoggedIn(const std::string& email) = 0;
 
+  // Called when user pod with |email| is selected.
+  virtual void UserSelected(const std::string& email) = 0;
+
   // Removes the user from the device. Note, it will verify that the given user
   // isn't the owner, so calling this method for the owner will take no effect.
   // Note, |delegate| can be NULL.