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

mojo/services/native_viewport/main.cc

Index: mojo/services/native_viewport/main.cc
diff --git a/mojo/services/native_viewport/main.cc b/mojo/services/native_viewport/main.cc
index 7a634b27dfdb9b27bb68c73b3f8397d32479f2e5..1a71ccd4ab67b5900b2d4ff22f673c09601885f0 100644
--- a/mojo/services/native_viewport/main.cc
+++ b/mojo/services/native_viewport/main.cc
@@ -5,6 +5,7 @@
 #include "base/macros.h"
 #include "base/message_loop/message_loop.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_connection.h"
 #include "mojo/public/cpp/application/application_delegate.h"
@@ -30,6 +31,8 @@ class NativeViewportAppDelegate
   void Initialize(ApplicationImpl* application) override {
     app_ = application;
 
+    TracingImpl::Create(application);
+
     if (app_->HasArg(kUseTestConfig))
       gfx::GLSurface::InitializeOneOffForTests();
     else if (app_->HasArg(kUseOSMesa))