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

mojo/services/window_manager/main.cc

 // 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.
 
 #include "base/memory/scoped_ptr.h"
 #include "mojo/application/application_runner_chromium.h"
+#include "mojo/common/tracing_impl.h"
 #include "mojo/public/c/system/main.h"
 #include "mojo/public/cpp/application/application_delegate.h"
 #include "mojo/public/cpp/application/service_provider_impl.h"
 #include "mojo/services/public/cpp/view_manager/view_manager.h"
 #include "mojo/services/public/cpp/view_manager/view_manager_delegate.h"
 #include "mojo/services/window_manager/window_manager_app.h"
 #include "mojo/services/window_manager/window_manager_delegate.h"
 
 // ApplicationDelegate implementation file for WindowManager users (e.g.
 // core window manager tests) that do not want to provide their own
 // ApplicationDelegate::Create().
 
 namespace mojo {
 
 class DefaultWindowManager : public ApplicationDelegate,
                              public ViewManagerDelegate,
                              public WindowManagerDelegate {
  public:
   DefaultWindowManager()
       : window_manager_app_(new WindowManagerApp(this, this)),
         view_manager_(NULL),
         root_(NULL) {}
   ~DefaultWindowManager() override {}
 
  private:
   // Overridden from ApplicationDelegate:
   void Initialize(ApplicationImpl* impl) override {
     window_manager_app_->Initialize(impl);
+    TracingImpl::Create(impl);
   }
   bool ConfigureIncomingConnection(ApplicationConnection* connection) override {
     window_manager_app_->ConfigureIncomingConnection(connection);
     return true;
   }
 
   // Overridden from ViewManagerDelegate:
   void OnEmbed(ViewManager* view_manager,
                View* root,
                ServiceProviderImpl* exported_services,
@@ skipping 20 matching lines @@
 
   MOJO_DISALLOW_COPY_AND_ASSIGN(DefaultWindowManager);
 };
 
 }  // namespace mojo
 
 MojoResult MojoMain(MojoHandle shell_handle) {
   mojo::ApplicationRunnerChromium runner(new mojo::DefaultWindowManager);
   return runner.Run(shell_handle);
 }