Add a NOT_DRAWN window in between the root_window and its children.

ash/public/cpp/shell_window_ids.h

Index: ash/public/cpp/shell_window_ids.h
diff --git a/ash/public/cpp/shell_window_ids.h b/ash/public/cpp/shell_window_ids.h
index f5f1fc233e92a0b54e0131f505755786801fe6df..38f27716fd75fcdcdcc68ff8e936d15febd95b78 100644
--- a/ash/public/cpp/shell_window_ids.h
+++ b/ash/public/cpp/shell_window_ids.h
@@ -17,93 +17,97 @@ namespace ash {
 // Used to indicate no shell window id.
 const int32_t kShellWindowId_Invalid = -1;
 
+// The screen rotation container in between root window and its children, used
+// for screen rotation animation.
+const int32_t kShellWindowId_ScreenRotationContainer = 0;
+
 // A higher-level container that holds all of the containers stacked below
 // kShellWindowId_LockScreenContainer.  Only used by PowerButtonController for
 // animating lower-level containers.
-const int32_t kShellWindowId_NonLockScreenContainersContainer = 0;
+const int32_t kShellWindowId_NonLockScreenContainersContainer = 1;
 
 // A higher-level container that holds containers that hold lock-screen
 // windows.  Only used by PowerButtonController for animating lower-level
 // containers.
-const int32_t kShellWindowId_LockScreenContainersContainer = 1;
+const int32_t kShellWindowId_LockScreenContainersContainer = 2;
 
 // A higher-level container that holds containers that hold lock-screen-related
 // windows (which we want to display while the screen is locked; effectively
 // containers stacked above kShellWindowId_LockSystemModalContainer).  Only used
 // by PowerButtonController for animating lower-level containers.
-const int32_t kShellWindowId_LockScreenRelatedContainersContainer = 2;
+const int32_t kShellWindowId_LockScreenRelatedContainersContainer = 3;
 
 // A container used for windows of WINDOW_TYPE_CONTROL that have no parent.
 // This container is not visible.
-const int32_t kShellWindowId_UnparentedControlContainer = 3;
+const int32_t kShellWindowId_UnparentedControlContainer = 4;
 
 // The wallpaper (desktop background) window.
-const int32_t kShellWindowId_WallpaperContainer = 4;
+const int32_t kShellWindowId_WallpaperContainer = 5;
 
 // The virtual keyboard container.
 // NOTE: this is lazily created.
-const int32_t kShellWindowId_VirtualKeyboardContainer = 5;
+const int32_t kShellWindowId_VirtualKeyboardContainer = 6;
 
 // The container for standard top-level windows.
-const int32_t kShellWindowId_DefaultContainer = 6;
+const int32_t kShellWindowId_DefaultContainer = 7;
 
 // The container for top-level windows with the 'always-on-top' flag set.
-const int32_t kShellWindowId_AlwaysOnTopContainer = 7;
+const int32_t kShellWindowId_AlwaysOnTopContainer = 8;
 
 // The container for the shelf.
-const int32_t kShellWindowId_ShelfContainer = 8;
+const int32_t kShellWindowId_ShelfContainer = 9;
 
 // The container for bubbles which float over the shelf.
-const int32_t kShellWindowId_ShelfBubbleContainer = 9;
+const int32_t kShellWindowId_ShelfBubbleContainer = 10;
 
 // The container for panel windows.
-const int32_t kShellWindowId_PanelContainer = 10;
+const int32_t kShellWindowId_PanelContainer = 11;
 
 // The container for the app list.
-const int32_t kShellWindowId_AppListContainer = 11;
+const int32_t kShellWindowId_AppListContainer = 12;
 
 // The container for user-specific modal windows.
-const int32_t kShellWindowId_SystemModalContainer = 12;
+const int32_t kShellWindowId_SystemModalContainer = 13;
 
 // The container for the lock screen wallpaper (lock screen background).
-const int32_t kShellWindowId_LockScreenWallpaperContainer = 13;
+const int32_t kShellWindowId_LockScreenWallpaperContainer = 14;
 
 // The container for the lock screen.
-const int32_t kShellWindowId_LockScreenContainer = 14;
+const int32_t kShellWindowId_LockScreenContainer = 15;
 
 // The container for the lock screen modal windows.
-const int32_t kShellWindowId_LockSystemModalContainer = 15;
+const int32_t kShellWindowId_LockSystemModalContainer = 16;
 
 // The container for the status area.
-const int32_t kShellWindowId_StatusContainer = 16;
+const int32_t kShellWindowId_StatusContainer = 17;
 
 // 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.
-const int32_t kShellWindowId_ImeWindowParentContainer = 17;
+const int32_t kShellWindowId_ImeWindowParentContainer = 18;
 
 // The container for menus.
-const int32_t kShellWindowId_MenuContainer = 18;
+const int32_t kShellWindowId_MenuContainer = 19;
 
 // The container for drag/drop images and tooltips.
-const int32_t kShellWindowId_DragImageAndTooltipContainer = 19;
+const int32_t kShellWindowId_DragImageAndTooltipContainer = 20;
 
 // The container for bubbles briefly overlaid onscreen to show settings changes
 // (volume, brightness, input method bubbles, etc.).
-const int32_t kShellWindowId_SettingBubbleContainer = 20;
+const int32_t kShellWindowId_SettingBubbleContainer = 21;
 
 // The container for special components overlaid onscreen, such as the
 // region selector for partial screenshots.
-const int32_t kShellWindowId_OverlayContainer = 21;
+const int32_t kShellWindowId_OverlayContainer = 22;
 
 // ID of the window created by PhantomWindowController or DragWindowController.
-const int32_t kShellWindowId_PhantomWindow = 22;
+const int32_t kShellWindowId_PhantomWindow = 23;
 
 // The container for mouse cursor.
-const int32_t kShellWindowId_MouseCursorContainer = 23;
+const int32_t kShellWindowId_MouseCursorContainer = 24;
 
 // The topmost container, used for power off animation.
-const int32_t kShellWindowId_PowerButtonAnimationContainer = 24;
+const int32_t kShellWindowId_PowerButtonAnimationContainer = 25;
 
 const int32_t kShellWindowId_Min = 0;
 const int32_t kShellWindowId_Max = kShellWindowId_PowerButtonAnimationContainer;
@@ -111,31 +115,32 @@ const int32_t kShellWindowId_Max = kShellWindowId_PowerButtonAnimationContainer;
 // A list of all the above valid container IDs. Add any new ID to this list.
 // This list is needed to validate we have no duplicate IDs.
 const int32_t kAllShellContainerIds[] = {
-  kShellWindowId_NonLockScreenContainersContainer,
-  kShellWindowId_LockScreenContainersContainer,
-  kShellWindowId_LockScreenRelatedContainersContainer,
-  kShellWindowId_UnparentedControlContainer,
-  kShellWindowId_WallpaperContainer,
-  kShellWindowId_VirtualKeyboardContainer,
-  kShellWindowId_DefaultContainer,
-  kShellWindowId_AlwaysOnTopContainer,
-  kShellWindowId_ShelfContainer,
-  kShellWindowId_ShelfBubbleContainer,
-  kShellWindowId_PanelContainer,
-  kShellWindowId_AppListContainer,
-  kShellWindowId_SystemModalContainer,
-  kShellWindowId_LockScreenWallpaperContainer,
-  kShellWindowId_LockScreenContainer,
-  kShellWindowId_LockSystemModalContainer,
-  kShellWindowId_StatusContainer,
-  kShellWindowId_ImeWindowParentContainer,
-  kShellWindowId_MenuContainer,
-  kShellWindowId_DragImageAndTooltipContainer,
-  kShellWindowId_SettingBubbleContainer,
-  kShellWindowId_OverlayContainer,
-  kShellWindowId_PhantomWindow,
-  kShellWindowId_MouseCursorContainer,
-  kShellWindowId_PowerButtonAnimationContainer,
+    kShellWindowId_ScreenRotationContainer,
+    kShellWindowId_NonLockScreenContainersContainer,
+    kShellWindowId_LockScreenContainersContainer,
+    kShellWindowId_LockScreenRelatedContainersContainer,
+    kShellWindowId_UnparentedControlContainer,
+    kShellWindowId_WallpaperContainer,
+    kShellWindowId_VirtualKeyboardContainer,
+    kShellWindowId_DefaultContainer,
+    kShellWindowId_AlwaysOnTopContainer,
+    kShellWindowId_ShelfContainer,
+    kShellWindowId_ShelfBubbleContainer,
+    kShellWindowId_PanelContainer,
+    kShellWindowId_AppListContainer,
+    kShellWindowId_SystemModalContainer,
+    kShellWindowId_LockScreenWallpaperContainer,
+    kShellWindowId_LockScreenContainer,
+    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