Add tracing service and make the shell+sky_viewer+services talk to it

mojo/services/view_manager/view_manager_app.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_VIEW_MANAGER_APP_H_
 #define MOJO_SERVICES_VIEW_MANAGER_VIEW_MANAGER_APP_H_
 
 #include "base/memory/scoped_ptr.h"
 #include "mojo/public/cpp/application/application_delegate.h"
 #include "mojo/public/cpp/application/interface_factory.h"
@@ skipping 11 matching lines @@
                        public ConnectionManagerDelegate,
                        public ErrorHandler,
                        public InterfaceFactory<ViewManagerService>,
                        public InterfaceFactory<WindowManagerInternalClient> {
  public:
   ViewManagerApp();
   ~ViewManagerApp() override;
 
  private:
   // ApplicationDelegate:
+  void Initialize(ApplicationImpl* app) override;
   bool ConfigureIncomingConnection(ApplicationConnection* connection) override;
 
   // ConnectionManagerDelegate:
   void OnLostConnectionToWindowManager() override;
   ClientConnection* CreateClientConnectionForEmbedAtView(
       ConnectionManager* connection_manager,
       ConnectionSpecificId creator_id,
       const std::string& creator_url,
       const std::string& url,
       const ViewId& root_id) override;
@@ skipping 14 matching lines @@
   WindowManagerInternalPtr wm_internal_;
   scoped_ptr<ConnectionManager> connection_manager_;
 
   DISALLOW_COPY_AND_ASSIGN(ViewManagerApp);
 };
 
 }  // namespace service
 }  // namespace mojo
 
 #endif  // MOJO_SERVICES_VIEW_MANAGER_VIEW_MANAGER_APP_H_