mandoline: write this after lunch.

mandoline/ui/omnibox/omnibox_application.h

Index: mandoline/ui/omnibox/omnibox_application.h
diff --git a/mandoline/ui/omnibox/omnibox_application.h b/mandoline/ui/omnibox/omnibox_application.h
index c14dd82afd4112a0c800ea85615099fce5828fbe..eeeea7f7c0e5c19a0ea8d374fa36766eeb5e007f 100644
--- a/mandoline/ui/omnibox/omnibox_application.h
+++ b/mandoline/ui/omnibox/omnibox_application.h
@@ -9,6 +9,7 @@
 #include "mandoline/ui/desktop_ui/public/interfaces/omnibox.mojom.h"
 #include "mojo/application/public/cpp/application_delegate.h"
 #include "mojo/application/public/cpp/interface_factory.h"
+#include "mojo/services/tracing/public/cpp/tracing_impl.h"
 
 namespace mojo {
 class ApplicationImpl;
@@ -33,6 +34,7 @@ class OmniboxApplication : public mojo::ApplicationDelegate,
               mojo::InterfaceRequest<Omnibox> request) override;
 
   mojo::ApplicationImpl* app_;
+  mojo::TracingImpl tracing_;
 
   DISALLOW_COPY_AND_ASSIGN(OmniboxApplication);
 };