Start the move of launcher_types.h to shelf.

ash/launcher/launcher_types.cc

 // 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.
 
 #include "ash/launcher/launcher_types.h"
 
+#include "ash/shelf/shelf_constants.h"
+
 namespace ash {
 
-const int kLauncherPreferredSize = 48;
-const int kLauncherBackgroundAlpha = 204;
-const int kInvalidImageResourceID = -1;
-const int kInvalidLauncherID = 0;
-const int kTimeToSwitchBackgroundMs = 1000;
-
 LauncherItem::LauncherItem()
     : type(TYPE_UNDEFINED),
-      id(kInvalidLauncherID),
+      id(kInvalidShelfID),
       status(STATUS_CLOSED) {
 }
 
 LauncherItem::~LauncherItem() {
 }
 
 LauncherItemDetails::LauncherItemDetails()
     : type(TYPE_UNDEFINED),
       image_resource_id(kInvalidImageResourceID) {
 }
 
 LauncherItemDetails::~LauncherItemDetails() {
 }
 
 }  // namespace ash