mash: Migrate wallpaper controllers to ash/common.

ash/common/wm_root_window_controller.h

Index: ash/common/wm_root_window_controller.h
diff --git a/ash/common/wm_root_window_controller.h b/ash/common/wm_root_window_controller.h
index e190072a1199d91c16f1939975804278c3085ab5..cc979fac48bb7c1484bb0956d25ea1bd8c25250e 100644
--- a/ash/common/wm_root_window_controller.h
+++ b/ash/common/wm_root_window_controller.h
@@ -17,6 +17,8 @@ class Point;
 namespace ash {
 
 class AlwaysOnTopController;
+class AnimatingWallpaperWidgetController;
+class WallpaperWidgetController;
 class WmShelf;
 class WmShell;
 class WmWindow;
@@ -36,6 +38,17 @@ class ASH_EXPORT WmRootWindowController {
     return root_window_layout_manager_;
   }
 
+  WallpaperWidgetController* wallpaper_widget_controller() {
+    return wallpaper_widget_controller_.get();
+  }
+  void SetWallpaperWidgetController(WallpaperWidgetController* controller);
+
+  AnimatingWallpaperWidgetController* animating_wallpaper_widget_controller() {
+    return animating_wallpaper_widget_controller_.get();
+  }
+  void SetAnimatingWallpaperWidgetController(
+      AnimatingWallpaperWidgetController* controller);
+
   WorkspaceController* workspace_controller() {
     return workspace_controller_.get();
   }
@@ -71,6 +84,11 @@ class ASH_EXPORT WmRootWindowController {
   // coordinates. This may return a point outside the root window's bounds.
   virtual gfx::Point GetLastMouseLocationInRoot() = 0;
 
+  // Called when the wallpaper animation has started or finished.
+  // TODO: port remaining classic ash wallpaper functionality here.
+  virtual void OnInitialWallpaperAnimationStarted();
+  virtual void OnWallpaperAnimationFinished(views::Widget* widget);
+
  protected:
   // Creates the containers (WmWindows) used by the shell.
   void CreateContainers();
@@ -85,6 +103,9 @@ class ASH_EXPORT WmRootWindowController {
 
   wm::RootWindowLayoutManager* root_window_layout_manager_;
 
+  std::unique_ptr<WallpaperWidgetController> wallpaper_widget_controller_;
+  std::unique_ptr<AnimatingWallpaperWidgetController>
+      animating_wallpaper_widget_controller_;
   std::unique_ptr<WorkspaceController> workspace_controller_;
 
   DISALLOW_COPY_AND_ASSIGN(WmRootWindowController);