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

mojo/services/surfaces/surfaces_service_application.cc

Index: mojo/services/surfaces/surfaces_service_application.cc
diff --git a/mojo/services/surfaces/surfaces_service_application.cc b/mojo/services/surfaces/surfaces_service_application.cc
index 46313074f9f7ffde8316d4122b79880c10bd192f..29390755bf24ff276dc3b86b3e32d4145ad868de 100644
--- a/mojo/services/surfaces/surfaces_service_application.cc
+++ b/mojo/services/surfaces/surfaces_service_application.cc
@@ -6,6 +6,7 @@
 
 #include "cc/surfaces/display.h"
 #include "mojo/application/application_runner_chromium.h"
+#include "mojo/common/tracing_impl.h"
 #include "mojo/public/c/system/main.h"
 #include "mojo/services/surfaces/surfaces_service_impl.h"
 
@@ -21,6 +22,10 @@ SurfacesServiceApplication::SurfacesServiceApplication()
 SurfacesServiceApplication::~SurfacesServiceApplication() {
 }
 
+void SurfacesServiceApplication::Initialize(ApplicationImpl* app) {
+  TracingImpl::Create(app);
+}
+
 bool SurfacesServiceApplication::ConfigureIncomingConnection(
     ApplicationConnection* connection) {
   connection->AddService(this);