Making Mandoline apps notice when all the objects they vended are gone so that it can terminate.

components/native_viewport/native_viewport_application_delegate.h

Index: components/native_viewport/native_viewport_application_delegate.h
diff --git a/components/native_viewport/native_viewport_application_delegate.h b/components/native_viewport/native_viewport_application_delegate.h
index e95bf2066a15be69277d5dfbce8b2ea5fad13012..dc65adf40f8f8f94889f048ff4700664c7c3b6be 100644
--- a/components/native_viewport/native_viewport_application_delegate.h
+++ b/components/native_viewport/native_viewport_application_delegate.h
@@ -8,6 +8,7 @@
 #include "base/macros.h"
 #include "components/gles2/gpu_impl.h"
 #include "components/native_viewport/public/interfaces/native_viewport.mojom.h"
+#include "mojo/application/app_lifetime_helper.h"
 #include "mojo/application/public/cpp/application_delegate.h"
 #include "mojo/application/public/cpp/interface_factory_impl.h"
 #include "mojo/common/tracing_impl.h"
@@ -49,6 +50,7 @@ class NativeViewportApplicationDelegate
   scoped_ptr<ui::PlatformEventSource> event_source_;
   bool is_headless_;
   mojo::TracingImpl tracing_;
+  mojo::AppLifetimeHelper app_lifetime_helper_;
 
   DISALLOW_COPY_AND_ASSIGN(NativeViewportApplicationDelegate);
 };