Adds a CloneAndAnimate function to WindowManagerInternalClient

mojo/services/view_manager/ids.h

 // Copyright 2014 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 MOJO_SERVICES_VIEW_MANAGER_IDS_H_
 #define MOJO_SERVICES_VIEW_MANAGER_IDS_H_
 
 #include "mojo/services/public/cpp/view_manager/types.h"
 #include "mojo/services/public/cpp/view_manager/util.h"
 
@@ skipping 35 matching lines @@
 inline ViewId RootViewId() {
   return ViewId(kInvalidConnectionId, 1);
 }
 
 // Returns a ViewId that is reserved to indicate no view. That is, no view will
 // ever be created with this id.
 inline ViewId InvalidViewId() {
   return ViewId(kInvalidConnectionId, 0);
 }
 
+// All cloned views use this id.
+inline ViewId ClonedViewId() {
+  return ViewId(kInvalidConnectionId, 2);
+}
+
 }  // namespace service
 }  // namespace mojo
 
 #endif  // MOJO_SERVICES_VIEW_MANAGER_IDS_H_