Asynchronously load wallpapers when user pod is selected.

chrome/browser/chromeos/login/user_manager_impl.h

Index: chrome/browser/chromeos/login/user_manager_impl.h
diff --git a/chrome/browser/chromeos/login/user_manager_impl.h b/chrome/browser/chromeos/login/user_manager_impl.h
index 18630e632da91ffcaab81dba2606871aaea53b86..aacb058a70813ea204a933ebd0121fe1d88c5743 100644
--- a/chrome/browser/chromeos/login/user_manager_impl.h
+++ b/chrome/browser/chromeos/login/user_manager_impl.h
@@ -47,6 +47,7 @@ class UserManagerImpl : public UserManager,
   virtual void DemoUserLoggedIn() OVERRIDE;
   virtual void GuestUserLoggedIn() OVERRIDE;
   virtual void EphemeralUserLoggedIn(const std::string& email) OVERRIDE;
+  virtual void UserSelected(const std::string& email) OVERRIDE;
   virtual void RemoveUser(const std::string& email,
                           RemoveUserDelegate* delegate) OVERRIDE;
   virtual void RemoveUserFromList(const std::string& email) OVERRIDE;
@@ -126,6 +127,8 @@ class UserManagerImpl : public UserManager,
   // list. Returns |NULL| otherwise.
   const User* FindUserInList(const std::string& email) const;
 
+  int FindUserWallpaperIndex(const std::string& email);
+
   // Makes stub user the current logged-in user (for test paths).
   void StubUserLoggedIn();
 
@@ -142,6 +145,10 @@ class UserManagerImpl : public UserManager,
   // Does not send LOGIN_USER_IMAGE_CHANGED notification.
   void SetInitialUserImage(const std::string& username);
 
+  // Sets one of the default wallpapers for the specified user and saves this
+  // settings in local state.
+  void SetInitialUserWallpaper(const std::string& username);
+
   // Sets image for user |username| and sends LOGIN_USER_IMAGE_CHANGED
   // notification unless this is a new user and image is set for the first time.
   // If |image| is empty, sets a stub image for the user.