Introduce window container to be used by lock screen app windows

ash/root_window_controller.cc

Index: ash/root_window_controller.cc
diff --git a/ash/root_window_controller.cc b/ash/root_window_controller.cc
index ab4e14c00d7ca1c3c2591422ea3786d594bc8733..6a1e1b8d51bc788db649a874b606436376cc6b92 100644
--- a/ash/root_window_controller.cc
+++ b/ash/root_window_controller.cc
@@ -40,6 +40,7 @@
 #include "ash/wm/boot_splash_screen_chromeos.h"
 #include "ash/wm/container_finder.h"
 #include "ash/wm/fullscreen_window_finder.h"
+#include "ash/wm/lock_action_handler_layout_manager.h"
 #include "ash/wm/lock_layout_manager.h"
 #include "ash/wm/panels/attached_panel_window_targeter.h"
 #include "ash/wm/panels/panel_layout_manager.h"
@@ -208,6 +209,8 @@ void ReparentAllWindows(aura::Window* src, aura::Window* dst) {
       kShellWindowId_LockSystemModalContainer,
       kShellWindowId_UnparentedControlContainer,
       kShellWindowId_OverlayContainer,
+      kShellWindowId_LockActionHandlerContainer,
+      kShellWindowId_LockActionHandlerContainer_Background,
   };
   const int kExtraContainerIdsToMoveInUnifiedMode[] = {
       kShellWindowId_LockScreenContainer,
@@ -809,6 +812,20 @@ void RootWindowController::InitLayoutManagers() {
   lock_modal_container->SetLayoutManager(
       new SystemModalContainerLayoutManager(lock_modal_container));
 
+  aura::Window* lock_action_handler_container =
+      GetContainer(kShellWindowId_LockActionHandlerContainer);
+  DCHECK(lock_action_handler_container);
+  lock_action_handler_container->SetLayoutManager(
+      new LockActionHandlerLayoutManager(lock_action_handler_container,
+                                         wm_shelf_.get()));
+
+  aura::Window* lock_action_handler_container_background =
+      GetContainer(kShellWindowId_LockActionHandlerContainer_Background);
+  DCHECK(lock_action_handler_container_background);
+  lock_action_handler_container_background->SetLayoutManager(
+      new LockActionHandlerLayoutManager(
+          lock_action_handler_container_background, wm_shelf_.get()));
+
   aura::Window* lock_container =
       GetContainer(kShellWindowId_LockScreenContainer);
   DCHECK(lock_container);
@@ -957,6 +974,17 @@ void RootWindowController::CreateContainers() {
       WmWindow::BoundsInScreenBehavior::USE_SCREEN_COORDINATES);
   modal_container->SetChildrenUseExtendedHitRegion();
 
+  WmWindow* lock_action_handler_container_background = CreateContainer(
+      kShellWindowId_LockActionHandlerContainer_Background,
+      "LockActionHandlerContainer_Background", lock_screen_containers);
+  lock_action_handler_container_background
+      ->SetSnapsChildrenToPhysicalPixelBoundary();
+  lock_action_handler_container_background
+      ->SetChildWindowVisibilityChangesAnimated();
+  lock_action_handler_container_background
+      ->SetBoundsInScreenBehaviorForChildren(
+          WmWindow::BoundsInScreenBehavior::USE_SCREEN_COORDINATES);
+
   // TODO(beng): Figure out if we can make this use
   // SystemModalContainerEventFilter instead of stops_event_propagation.
   WmWindow* lock_container =
@@ -967,6 +995,14 @@ void RootWindowController::CreateContainers() {
       WmWindow::BoundsInScreenBehavior::USE_SCREEN_COORDINATES);
   // TODO(beng): stopsevents
 
+  WmWindow* lock_action_handler_container =
+      CreateContainer(kShellWindowId_LockActionHandlerContainer,
+                      "LockActionHandlerContainer", lock_screen_containers);
+  lock_action_handler_container->SetSnapsChildrenToPhysicalPixelBoundary();
+  lock_action_handler_container->SetChildWindowVisibilityChangesAnimated();
+  lock_action_handler_container->SetBoundsInScreenBehaviorForChildren(
+      WmWindow::BoundsInScreenBehavior::USE_SCREEN_COORDINATES);
+
   WmWindow* lock_modal_container =
       CreateContainer(kShellWindowId_LockSystemModalContainer,
                       "LockSystemModalContainer", lock_screen_containers);