Draggable peeking/fullscreen launcher with transparent background.

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 fcd78182680b2e5d2ac8befd1292adb3fe3308b9..95f7e26c8a92513c0eb8ad2f712fac904d36fdde 100644
--- a/ash/root_window_controller.cc
+++ b/ash/root_window_controller.cc
@@ -901,6 +901,13 @@ void RootWindowController::CreateContainers() {
   always_on_top_container->SetBoundsInScreenBehaviorForChildren(
       WmWindow::BoundsInScreenBehavior::USE_SCREEN_COORDINATES);
 
+  WmWindow* app_list_container =
+      CreateContainer(kShellWindowId_AppListContainer, "AppListContainer",
+                      non_lock_screen_containers);
+  app_list_container->SetSnapsChildrenToPhysicalPixelBoundary();
+  app_list_container->SetBoundsInScreenBehaviorForChildren(
+      WmWindow::BoundsInScreenBehavior::USE_SCREEN_COORDINATES);
+
   WmWindow* shelf_container =
       CreateContainer(kShellWindowId_ShelfContainer, "ShelfContainer",
                       non_lock_screen_containers);
@@ -924,13 +931,6 @@ void RootWindowController::CreateContainers() {
       WmWindow::BoundsInScreenBehavior::USE_SCREEN_COORDINATES);
   shelf_bubble_container->SetLockedToRoot(true);
 
-  WmWindow* app_list_container =
-      CreateContainer(kShellWindowId_AppListContainer, "AppListContainer",
-                      non_lock_screen_containers);
-  app_list_container->SetSnapsChildrenToPhysicalPixelBoundary();
-  app_list_container->SetBoundsInScreenBehaviorForChildren(
-      WmWindow::BoundsInScreenBehavior::USE_SCREEN_COORDINATES);
-
   WmWindow* modal_container =
       CreateContainer(kShellWindowId_SystemModalContainer,
                       "SystemModalContainer", non_lock_screen_containers);