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 aecda8e5f4d07bdab603dd14589e1bac0483cab5..ccad14125d95e8c63568a68473668e9445b6db88 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;
+
   // Called when browser session is started i.e. after
   // browser_init.LaunchBrowser(...) was called after user sign in.
   // When user is at the image screen IsUserLoggedIn() will return true