Rename ash desktop_background to wallpaper.

ash/test/test_session_state_animator.h

 // Copyright 2014 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_TEST_TEST_SESSION_STATE_ANIMATOR_H_
 #define ASH_TEST_TEST_SESSION_STATE_ANIMATOR_H_
 
 #include <stddef.h>
 
 #include <map>
@@ skipping 54 matching lines @@
 
   // ash::SessionStateAnimator:
   void StartAnimation(int container_mask,
                       AnimationType type,
                       AnimationSpeed speed) override;
   void StartAnimationWithCallback(int container_mask,
                                   AnimationType type,
                                   AnimationSpeed speed,
                                   base::Closure callback) override;
   AnimationSequence* BeginAnimationSequence(base::Closure callback) override;
-  bool IsBackgroundHidden() const override;
-  void ShowBackground() override;
-  void HideBackground() override;
+  bool IsWallpaperHidden() const override;
+  void ShowWallpaper() override;
+  void HideWallpaper() override;
 
  private:
   class AnimationSequence;
   friend class AnimationSequence;
 
   // Data structure to track the currently active animations and their
   // callbacks.
   struct ActiveAnimation {
     ActiveAnimation(int animation_epoch,
                     base::TimeDelta duration,
@@ skipping 56 matching lines @@
   // Used for easy iteration over all the containers.
   static const SessionStateAnimator::Container kAllContainers[];
 
   // A map of currently active animations.
   ActiveAnimationsMap active_animations_;
 
   // A time counter that tracks the last scheduled animation or animation
   // sequence.
   int last_animation_epoch_;
 
-  // Tracks whether the background is hidden or not.
-  bool is_background_hidden_;
+  // Tracks whether the wallpaper is hidden or not.
+  bool is_wallpaper_hidden_;
 
   DISALLOW_COPY_AND_ASSIGN(TestSessionStateAnimator);
 };
 
 }  // namespace test
 }  // namespace ash
 
 #endif  // ASH_TEST_TEST_SESSION_STATE_ANIMATOR_H_