Refactor backdrop that is currently used in the maximized mode.

ui/aura/client/aura_constants.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 "ui/aura/client/aura_constants.h"
 
 #include "services/ui/public/interfaces/window_manager_constants.mojom.h"
 #include "ui/base/class_property.h"
 #include "ui/gfx/geometry/rect.h"
 
@@ skipping 23 matching lines @@
      bool, kAccessibilityFocusFallsbackToWidgetKey, true);
 DEFINE_UI_CLASS_PROPERTY_KEY(bool, kActivateOnPointerKey, true);
 DEFINE_UI_CLASS_PROPERTY_KEY(bool, kAlwaysOnTopKey, false);
 DEFINE_UI_CLASS_PROPERTY_KEY(bool, kAnimationsDisabledKey, false);
 DEFINE_OWNED_UI_CLASS_PROPERTY_KEY(gfx::ImageSkia, kAppIconKey, nullptr);
 DEFINE_UI_CLASS_PROPERTY_KEY(int, kAppType, 0);
 DEFINE_UI_CLASS_PROPERTY_KEY(bool, kConstrainedWindowKey, false);
 DEFINE_UI_CLASS_PROPERTY_KEY(bool, kCreatedByUserGesture, false);
 DEFINE_UI_CLASS_PROPERTY_KEY(bool, kDrawAttentionKey, false);
 DEFINE_UI_CLASS_PROPERTY_KEY(FocusClient*, kFocusClientKey, nullptr);
+DEFINE_UI_CLASS_PROPERTY_KEY(bool, kHasBackdrop, false);
 DEFINE_UI_CLASS_PROPERTY_KEY(Window*, kHostWindowKey, nullptr);
 DEFINE_UI_CLASS_PROPERTY_KEY(bool, kImmersiveFullscreenKey, false);
 DEFINE_UI_CLASS_PROPERTY_KEY(bool, kMirroringEnabledKey, false);
 DEFINE_UI_CLASS_PROPERTY_KEY(WindowEmbedType,
                              kEmbedType,
                              WindowEmbedType::NONE);
 DEFINE_UI_CLASS_PROPERTY_KEY(ui::ModalType, kModalKey, ui::MODAL_TYPE_NONE);
 DEFINE_OWNED_UI_CLASS_PROPERTY_KEY(std::string, kNameKey, nullptr);
 DEFINE_OWNED_UI_CLASS_PROPERTY_KEY(gfx::Size, kPreferredSize, nullptr);
 DEFINE_UI_CLASS_PROPERTY_KEY(
     ui::WindowShowState, kPreMinimizedShowStateKey, ui::SHOW_STATE_DEFAULT);
 DEFINE_UI_CLASS_PROPERTY_KEY(
     ui::WindowShowState, kPreFullscreenShowStateKey, ui::SHOW_STATE_DEFAULT);
 DEFINE_UI_CLASS_PROPERTY_KEY(int32_t,
                            kResizeBehaviorKey,
                            ui::mojom::kResizeBehaviorCanResize);
 DEFINE_OWNED_UI_CLASS_PROPERTY_KEY(gfx::Rect, kRestoreBoundsKey, nullptr);
 DEFINE_UI_CLASS_PROPERTY_KEY(
     ui::WindowShowState, kShowStateKey, ui::SHOW_STATE_DEFAULT);
 DEFINE_OWNED_UI_CLASS_PROPERTY_KEY(base::string16, kTitleKey, nullptr);
 DEFINE_UI_CLASS_PROPERTY_KEY(int, kTopViewInset, 0);
 DEFINE_UI_CLASS_PROPERTY_KEY(SkColor, kTopViewColor, SK_ColorTRANSPARENT);
 DEFINE_OWNED_UI_CLASS_PROPERTY_KEY(gfx::ImageSkia, kWindowIconKey, nullptr);
 DEFINE_UI_CLASS_PROPERTY_KEY(ui::mojom::WindowType,
                            kWindowTypeKey,
                            ui::mojom::WindowType::UNKNOWN);
 
 }  // namespace client
 }  // namespace aura