Rename ash desktop_background to wallpaper.

ash/wm/lock_state_controller.h

 // Copyright 2013 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_WM_LOCK_STATE_CONTROLLER_H_
 #define ASH_WM_LOCK_STATE_CONTROLLER_H_
 
 #include <memory>
 
 #include "ash/ash_export.h"
@@ skipping 192 matching lines @@
 
   void set_animator_for_test(SessionStateAnimator* animator) {
     animator_.reset(animator);
   }
 
  private:
   friend class test::PowerButtonControllerTest;
   friend class test::LockStateControllerTest;
 
   struct UnlockedStateProperties {
-    bool background_is_hidden;
+    bool wallpaper_is_hidden;
   };
 
   // Reverts the pre-lock animation, reports the error.
   void OnLockFailTimeout();
 
   // Starts timer for gap between lock and shutdown.
   void StartLockToShutdownTimer();
 
   // Calls StartShutdownAnimation().
   void OnLockToShutdownTimeout();
@@ skipping 31 matching lines @@
   // These methods are called when corresponding animation completes.
   void LockAnimationCancelled();
   void PreLockAnimationFinished(bool request_lock);
   void PostLockAnimationFinished();
   void UnlockAnimationAfterUIDestroyedFinished();
 
   // Stores properties of UI that have to be temporarily modified while locking.
   void StoreUnlockedProperties();
   void RestoreUnlockedProperties();
 
-  // Fades in background layer with |speed| if it was hidden in unlocked state.
-  void AnimateBackgroundAppearanceIfNecessary(
+  // Fades in wallpaper layer with |speed| if it was hidden in unlocked state.
+  void AnimateWallpaperAppearanceIfNecessary(
       ash::SessionStateAnimator::AnimationSpeed speed,
       SessionStateAnimator::AnimationSequence* animation_sequence);
 
-  // Fades out background layer with |speed| if it was hidden in unlocked state.
-  void AnimateBackgroundHidingIfNecessary(
+  // Fades out wallpaper layer with |speed| if it was hidden in unlocked state.
+  void AnimateWallpaperHidingIfNecessary(
       ash::SessionStateAnimator::AnimationSpeed speed,
       SessionStateAnimator::AnimationSequence* animation_sequence);
 
   std::unique_ptr<SessionStateAnimator> animator_;
 
   std::unique_ptr<LockStateControllerDelegate> delegate_;
 
   // The current login status, or original login status from before we locked.
   LoginStatus login_status_;
 
@@ skipping 39 matching lines @@
   base::Closure lock_screen_displayed_callback_;
 
   base::WeakPtrFactory<LockStateController> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(LockStateController);
 };
 
 }  // namespace ash
 
 #endif  // ASH_WM_LOCK_STATE_CONTROLLER_H_