Introduce window container to be used by lock screen app windows

ash/public/cpp/shell_window_ids.h

 // 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.
 
 #ifndef ASH_PUBLIC_CPP_SHELL_WINDOW_IDS_H_
 #define ASH_PUBLIC_CPP_SHELL_WINDOW_IDS_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 59 matching lines @@
 
   // The container for user-specific modal windows.
   kShellWindowId_SystemModalContainer,
 
   // The container for the lock screen wallpaper (lock screen background).
   kShellWindowId_LockScreenWallpaperContainer,
 
   // The container for the lock screen.
   kShellWindowId_LockScreenContainer,
 
+  // The container for windows that handle lock tray actions (e.g. new note
+  // action). The action handler container's children should be visible on lock
+  // screen, but only when an action is being handled - i.e. action handling
+  // state is either:
+  //  *  active - the container is stacked above LockScreenContainer
+  //  *  background - the container is stacked below LockScreenContainer
+  kShellWindowId_LockActionHandlerContainer,
+
   // The container for the lock screen modal windows.
   kShellWindowId_LockSystemModalContainer,
 
   // The container for the status area.
   kShellWindowId_StatusContainer,
 
   // A parent container that holds the virtual keyboard container and ime
   // windows if any. This is to ensure that the virtual keyboard or ime window
   // is stacked above most containers but below the mouse cursor and the power
   // off animation.
@@ skipping 39 matching lines @@
     kShellWindowId_VirtualKeyboardContainer,
     kShellWindowId_DefaultContainer,
     kShellWindowId_AlwaysOnTopContainer,
     kShellWindowId_ShelfContainer,
     kShellWindowId_ShelfBubbleContainer,
     kShellWindowId_PanelContainer,
     kShellWindowId_AppListContainer,
     kShellWindowId_SystemModalContainer,
     kShellWindowId_LockScreenWallpaperContainer,
     kShellWindowId_LockScreenContainer,
+    kShellWindowId_LockActionHandlerContainer,
     kShellWindowId_LockSystemModalContainer,
     kShellWindowId_StatusContainer,
     kShellWindowId_ImeWindowParentContainer,
     kShellWindowId_MenuContainer,
     kShellWindowId_DragImageAndTooltipContainer,
     kShellWindowId_SettingBubbleContainer,
     kShellWindowId_OverlayContainer,
     kShellWindowId_PhantomWindow,
     kShellWindowId_MouseCursorContainer,
     kShellWindowId_PowerButtonAnimationContainer,
 };
 
 // These are the list of container ids of containers which may contain windows
 // that need to be activated.
 ASH_PUBLIC_EXPORT extern const int32_t kActivatableShellWindowIds[];
 ASH_PUBLIC_EXPORT extern const size_t kNumActivatableShellWindowIds;
 
 // Returns true if |id| is in |kActivatableShellWindowIds|.
 ASH_PUBLIC_EXPORT bool IsActivatableShellWindowId(int32_t id);
 
 }  // namespace ash
 
 #endif  // ASH_PUBLIC_CPP_SHELL_WINDOW_IDS_H_