Made launcher hidden when kicking off chrome in app mode.

ash/shelf_types.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_SHELF_TYPES_H_
 #define ASH_SHELF_TYPES_H_
 
 namespace ash {
 
 enum ShelfAlignment {
   SHELF_ALIGNMENT_BOTTOM,
   SHELF_ALIGNMENT_LEFT,
   SHELF_ALIGNMENT_RIGHT,
   SHELF_ALIGNMENT_TOP,
 };
 
 enum ShelfAutoHideBehavior {
   // Always auto-hide.
   SHELF_AUTO_HIDE_BEHAVIOR_ALWAYS,
 
   // Never auto-hide.
   SHELF_AUTO_HIDE_BEHAVIOR_NEVER,
+
+  // Always hide.
+  SHELF_AUTO_HIDE_ALWAYS_HIDDEN,
 };
 
 enum ShelfVisibilityState {
   // Always visible.
   SHELF_VISIBLE,
 
   // A couple of pixels are reserved at the bottom for the shelf.
   SHELF_AUTO_HIDE,
 
   // Nothing is shown. Used for fullscreen windows.
   SHELF_HIDDEN,
 };
 
 enum ShelfAutoHideState {
   SHELF_AUTO_HIDE_SHOWN,
   SHELF_AUTO_HIDE_HIDDEN,
 };
 
 }  // namespace ash
 
 #endif  // ASH_SHELF_TYPES_H_