Move all wallpaper file loading and decoding from DesktopBackgroundController to WallpaperManager.

ash/desktop_background/desktop_background_controller.h

Index: ash/desktop_background/desktop_background_controller.h
diff --git a/ash/desktop_background/desktop_background_controller.h b/ash/desktop_background/desktop_background_controller.h
index 505f7441792b86584a009f06becf2453195119f0..219e3c82f360e2cc2fb2be7ed350342b5af7d3d5 100644
--- a/ash/desktop_background/desktop_background_controller.h
+++ b/ash/desktop_background/desktop_background_controller.h
@@ -23,10 +23,6 @@ namespace aura {
 class Window;
 }
 
-namespace base {
-class CommandLine;
-}
-
 namespace ash {
 
 enum WallpaperLayout {
@@ -43,34 +39,17 @@ enum WallpaperLayout {
   WALLPAPER_LAYOUT_TILE,
 };
 
-enum WallpaperResolution {
-  WALLPAPER_RESOLUTION_LARGE,
-  WALLPAPER_RESOLUTION_SMALL
-};
-
 const SkColor kLoginWallpaperColor = 0xFEFEFE;
 
-// The width and height of small/large resolution wallpaper. When screen size is
-// smaller than |kSmallWallpaperMaxWidth| and |kSmallWallpaperMaxHeight|, the
-// small resolution wallpaper should be used. Otherwise, uses the large
-// resolution wallpaper.
-ASH_EXPORT extern const int kSmallWallpaperMaxWidth;
-ASH_EXPORT extern const int kSmallWallpaperMaxHeight;
-ASH_EXPORT extern const int kLargeWallpaperMaxWidth;
-ASH_EXPORT extern const int kLargeWallpaperMaxHeight;
-
-// The width and heigh of wallpaper thumbnails.
-ASH_EXPORT extern const int kWallpaperThumbnailWidth;
-ASH_EXPORT extern const int kWallpaperThumbnailHeight;
-
 class DesktopBackgroundControllerObserver;
 class WallpaperResizer;
 
-// Loads selected desktop wallpaper from file system asynchronously and updates
-// background layer if loaded successfully.
+// Updates background layer if necessary.
 class ASH_EXPORT DesktopBackgroundController
     : public DisplayController::Observer {
  public:
+  class TestAPI;
+
   enum BackgroundMode {
     BACKGROUND_NONE,
     BACKGROUND_IMAGE,
@@ -83,10 +62,6 @@ class ASH_EXPORT DesktopBackgroundController
     return desktop_background_mode_;
   }
 
-  void set_command_line_for_testing(base::CommandLine* command_line) {
-    command_line_for_testing_ = command_line;
-  }
-
   // Add/Remove observers.
   void AddObserver(DesktopBackgroundControllerObserver* observer);
   void RemoveObserver(DesktopBackgroundControllerObserver* observer);
@@ -100,18 +75,13 @@ class ASH_EXPORT DesktopBackgroundController
   // Initialize root window's background.
   void OnRootWindowAdded(aura::Window* root_window);
 
-  // Loads builtin wallpaper asynchronously and sets to current wallpaper
-  // after loaded. Returns true if the controller started loading the
-  // wallpaper and false otherwise (i.e. the appropriate wallpaper was
-  // already loading or loaded).
-  bool SetDefaultWallpaper(bool is_guest);
-
-  // Sets the user selected custom wallpaper. Called when user selected a file
-  // from file system or changed the layout of wallpaper.
-  void SetCustomWallpaper(const gfx::ImageSkia& image, WallpaperLayout layout);
-
-  // Cancels |default_wallpaper_loader_| if non-NULL.
-  void CancelDefaultWallpaperLoader();
+  // Sets wallpaper. This is mostly called by WallpaperManager to set
+  // the default or user selected custom wallpaper.
+  // Returns true if new image was actually set. And false when duplicate set
+  // request detected.
+  bool SetWallpaperImage(const gfx::ImageSkia& image, WallpaperLayout layout);
+  // The same, but image from resources is used.
+  bool SetWallpaperResource(int resource_id, WallpaperLayout layout);
 
   // Creates an empty wallpaper. Some tests require a wallpaper widget is ready
   // when running. However, the wallpaper widgets are now created
@@ -121,9 +91,6 @@ class ASH_EXPORT DesktopBackgroundController
   // crashes. An example test is SystemGestureEventFilterTest.ThreeFingerSwipe.
   void CreateEmptyWallpaper();
 
-  // Returns the appropriate wallpaper resolution for all root windows.
-  WallpaperResolution GetAppropriateResolution();
-
   // Move all desktop widgets to locked container.
   // Returns true if the desktop moved.
   bool MoveDesktopToLockedContainer();
@@ -135,30 +102,28 @@ class ASH_EXPORT DesktopBackgroundController
   // Overrides DisplayController::Observer:
   virtual void OnDisplayConfigurationChanged() OVERRIDE;
 
+  // Returns the maximum size of all displays combined in native
+  // resolutions.  Note that this isn't the bounds of the display who
+  // has maximum resolutions. Instead, this returns the size of the
+  // maximum width of all displays, and the maximum height of all displays.
+  static gfx::Size GetMaxDisplaySizeInNative();
+
  private:
   friend class DesktopBackgroundControllerTest;
+  //  friend class chromeos::WallpaperManagerBrowserTestDefaultWallpaper;
   FRIEND_TEST_ALL_PREFIXES(DesktopBackgroundControllerTest, GetMaxDisplaySize);
 
-  // An operation to asynchronously loads wallpaper.
-  class WallpaperLoader;
-
-  // Returns true if the specified default wallpaper is already being
-  // loaded by |wallpaper_loader_| or stored in |current_wallpaper_|.
-  bool DefaultWallpaperIsAlreadyLoadingOrLoaded(
-      const base::FilePath& image_file, int image_resource_id) const;
-
-  // Returns true if the specified custom wallpaper is already stored
+  // Returns true if the specified wallpaper is already stored
   // in |current_wallpaper_|.
-  bool CustomWallpaperIsAlreadyLoaded(const gfx::ImageSkia& image) const;
+  // If |image| is NULL, resource_id is compared.
+  bool WallpaperIsAlreadyLoaded(const gfx::ImageSkia* image,
+                                int resource_id,
+                                WallpaperLayout layout) const;
 
   // Creates view for all root windows, or notifies them to repaint if they
   // already exist.
   void SetDesktopBackgroundImageMode();
 
-  // Creates a new background widget and sets the background mode to image mode.
-  // Called after a default wallpaper has been loaded successfully.
-  void OnDefaultWallpaperLoadCompleted(scoped_refptr<WallpaperLoader> loader);
-
   // Creates and adds component for current mode (either Widget or Layer) to
   // |root_window|.
   void InstallDesktopController(aura::Window* root_window);
@@ -184,15 +149,6 @@ class ASH_EXPORT DesktopBackgroundController
     wallpaper_reload_delay_ = value;
   }
 
-  // Returns the maximum size of all displays combined in native
-  // resolutions.  Note that this isn't the bounds of the display who
-  // has maximum resolutions. Instead, this returns the size of the
-  // maximum width of all displays, and the maximum height of all displays.
-  static gfx::Size GetMaxDisplaySizeInNative();
-
-  // If non-NULL, used in place of the real command line.
-  base::CommandLine* command_line_for_testing_;
-
   // Can change at runtime.
   bool locked_;
 
@@ -205,19 +161,8 @@ class ASH_EXPORT DesktopBackgroundController
   // The current wallpaper.
   scoped_ptr<WallpaperResizer> current_wallpaper_;
 
-  // If a default wallpaper is stored in |current_wallpaper_|, the path and
-  // resource ID that were passed to WallpaperLoader when loading it.
-  // Otherwise, empty and -1, respectively.
-  base::FilePath current_default_wallpaper_path_;
-  int current_default_wallpaper_resource_id_;
-
   gfx::Size current_max_display_size_;
 
-  // Loads default wallpaper from disk.
-  scoped_refptr<WallpaperLoader> default_wallpaper_loader_;
-
-  base::WeakPtrFactory<DesktopBackgroundController> weak_ptr_factory_;
-
   base::OneShotTimer<DesktopBackgroundController> timer_;
 
   int wallpaper_reload_delay_;