Add support for multiple roots to the client lib.

mojo/services/public/cpp/view_manager/lib/view_manager_private.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_PUBLIC_CPP_VIEW_MANAGER_LIB_VIEW_MANAGER_PRIVATE_H_
 #define MOJO_SERVICES_PUBLIC_CPP_VIEW_MANAGER_LIB_VIEW_MANAGER_PRIVATE_H_
 
 #include "base/basictypes.h"
 #include "mojo/services/public/cpp/view_manager/lib/view_manager_synchronizer.h"
 #include "mojo/services/public/cpp/view_manager/view_manager.h"
 
 namespace mojo {
 namespace view_manager {
 
 class ViewManagerSynchronizer;
 
 class ViewManagerPrivate {
  public:
   explicit ViewManagerPrivate(ViewManager* manager);
   ~ViewManagerPrivate();
 
-  void NotifyReady() {
-    manager_->ready_callback_.Run(manager_);
-  }
-
   ViewManagerSynchronizer* synchronizer() {
     return manager_->synchronizer_;
   }
   void set_synchronizer(ViewManagerSynchronizer* synchronizer) {
     manager_->synchronizer_ = synchronizer;
   }
 
-  void set_root(ViewTreeNode* root) { manager_->tree_ = root; }
+  void AddRoot(ViewTreeNode* root);
+  void RemoveRoot(ViewTreeNode* root);
 
   void AddNode(TransportNodeId node_id, ViewTreeNode* node);
   void RemoveNode(TransportNodeId node_id);
 
   void AddView(TransportViewId view_id, View* view);
   void RemoveView(TransportViewId view_id);
 
   // Returns true if the ViewManager's synchronizer is connected to the service.
   bool connected() { return manager_->synchronizer_->connected(); }
 
  private:
   ViewManager* manager_;
 
   DISALLOW_COPY_AND_ASSIGN(ViewManagerPrivate);
 };
 
 }  // namespace view_manager
 }  // namespace mojo
 
 #endif  // MOJO_SERVICES_PUBLIC_CPP_VIEW_MANAGER_LIB_VIEW_MANAGER_PRIVATE_H_