Refactor backdrop that is currently used in the maximized mode.

ash/wm/workspace_controller.cc

 // Copyright (c) 2012 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.
 
 #include "ash/wm/workspace_controller.h"
 
 #include <utility>
 
 #include "ash/public/cpp/shell_window_ids.h"
 #include "ash/root_window_controller.h"
 #include "ash/shelf/wm_shelf.h"
 #include "ash/shell_port.h"
 #include "ash/wm/fullscreen_window_finder.h"
 #include "ash/wm/window_state.h"
 #include "ash/wm/window_state_aura.h"
 #include "ash/wm/wm_window_animations.h"
+#include "ash/wm/workspace/backdrop_controller.h"
+#include "ash/wm/workspace/backdrop_delegate.h"
 #include "ash/wm/workspace/workspace_event_handler.h"
 #include "ash/wm/workspace/workspace_layout_manager.h"
-#include "ash/wm/workspace/workspace_layout_manager_backdrop_delegate.h"
 #include "ash/wm_window.h"
 #include "ui/aura/window.h"
 #include "ui/compositor/layer.h"
 #include "ui/compositor/scoped_layer_animation_settings.h"
 
 namespace ash {
 namespace {
 
 // Amount of time to pause before animating anything. Only used during initial
 // animation (when logging in).
@@ skipping 74 matching lines @@
             ui::LayerAnimationElement::BRIGHTNESS |
             ui::LayerAnimationElement::VISIBILITY);
     settings.SetTweenType(gfx::Tween::EASE_OUT);
     settings.SetTransitionDuration(
         base::TimeDelta::FromMilliseconds(kInitialAnimationDurationMS));
     layer->SetTransform(gfx::Transform());
     layer->SetOpacity(1.0f);
   }
 }
 
-void WorkspaceController::SetMaximizeBackdropDelegate(
-    std::unique_ptr<WorkspaceLayoutManagerBackdropDelegate> delegate) {
-  layout_manager_->SetMaximizeBackdropDelegate(std::move(delegate));
+void WorkspaceController::SetBackdropDelegate(
+    std::unique_ptr<BackdropDelegate> delegate) {
+  layout_manager_->SetBackdropDelegate(std::move(delegate));
 }
 
 void WorkspaceController::OnWindowDestroying(aura::Window* window) {
   DCHECK_EQ(window, viewport_);
   viewport_->RemoveObserver(this);
   viewport_ = nullptr;
   // Destroy |event_handler_| too as it depends upon |window|.
   event_handler_.reset();
   layout_manager_ = nullptr;
 }
 
 }  // namespace ash