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 36a9fc431bc8e566a2ee6ba7e73e7a2f81f00a7c..cb510db15c1230bf9869a6fca8c729ed0a33b49c 100644
--- a/ash/root_window_controller.cc
+++ b/ash/root_window_controller.cc
@@ -910,6 +910,13 @@ 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);
@@ -933,13 +940,6 @@ 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);