ash: Display system background while loading wallpaper.

ash/shell_delegate.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef ASH_SHELL_DELEGATE_H_
 #define ASH_SHELL_DELEGATE_H_
 
 #include <vector>
 
 #include "ash/ash_export.h"
@@ skipping 46 matching lines @@
  public:
   // The Shell owns the delegate.
   virtual ~ShellDelegate() {}
 
   // Returns true if user has logged in.
   virtual bool IsUserLoggedIn() = 0;
 
   // Returns true if we're logged in and browser has been started
   virtual bool IsSessionStarted() = 0;
 
+  // Returns true if this is the first time that the shell has been run after
+  // the system has booted.  false is returned after the shell has been
+  // restarted, typically due to logging in as a guest or logging out.
+  virtual bool IsFirstRunAfterBoot() = 0;
+
   // Invoked when a user locks the screen.
   virtual void LockScreen() = 0;
 
   // Unlock the screen. Currently used only for tests.
   virtual void UnlockScreen() = 0;
 
   // Returns true if the screen is currently locked.
   virtual bool IsScreenLocked() const = 0;
 
   // Shuts down the environment.
@@ skipping 85 matching lines @@
   virtual void SaveScreenMagnifierScale(double scale) = 0;
 
   // Gets a saved value of the zoom scale of full screen magnifier. If a value
   // is not saved, return a negative value.
   virtual double GetSavedScreenMagnifierScale() = 0;
 };
 
 }  // namespace ash
 
 #endif  // ASH_SHELL_DELEGATE_H_