mash: Migrate wallpaper controllers to ash/common.

ash/aura/wm_root_window_controller_aura.cc

Index: ash/aura/wm_root_window_controller_aura.cc
diff --git a/ash/aura/wm_root_window_controller_aura.cc b/ash/aura/wm_root_window_controller_aura.cc
index 2fedcf45849ef82f42f5dd0cd8cf89e1d6d75069..7217ba22d53a8c6b560d17df0e5170f9cf283acf 100644
--- a/ash/aura/wm_root_window_controller_aura.cc
+++ b/ash/aura/wm_root_window_controller_aura.cc
@@ -107,4 +107,15 @@ gfx::Point WmRootWindowControllerAura::GetLastMouseLocationInRoot() {
       ->GetLastMouseLocationInRoot();
 }
 
+void WmRootWindowControllerAura::OnInitialWallpaperAnimationStarted() {
+  root_window_controller_->OnInitialWallpaperAnimationStarted();
+  WmRootWindowController::OnInitialWallpaperAnimationStarted();
+}
+
+void WmRootWindowControllerAura::OnWallpaperAnimationFinished(
+    views::Widget* widget) {
+  root_window_controller_->OnWallpaperAnimationFinished(widget);
+  WmRootWindowController::OnWallpaperAnimationFinished(widget);
+}
+
 }  // namespace ash