Make TracingImpl take a Shell* and args, instead of an ApplicationImpl*.

services/ui/launcher/launcher_app.cc

Index: services/ui/launcher/launcher_app.cc
diff --git a/services/ui/launcher/launcher_app.cc b/services/ui/launcher/launcher_app.cc
index d301cc164fece10eae0d1d85fa089aeaa1f30895..c231ce6c69ca17cdfd3c7a90f99530852d2ed8bc 100644
--- a/services/ui/launcher/launcher_app.cc
+++ b/services/ui/launcher/launcher_app.cc
@@ -30,7 +30,7 @@ void LauncherApp::Initialize(mojo::ApplicationImpl* app_impl) {
   settings.logging_dest = logging::LOG_TO_SYSTEM_DEBUG_LOG;
   logging::InitLogging(settings);
 
-  tracing_.Initialize(app_impl_);
+  tracing_.Initialize(app_impl_->shell(), &app_impl_->args());
   TRACE_EVENT0("launcher", __func__);
 
   InitCompositor();