Make Mandoline shut down cleanly.

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 4584ffff05b837f38d86c023d7d7d2019f936fe9..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"
@@ -17,6 +18,10 @@ class ApplicationConnection;
 class ApplicationImpl;
 }
 
+namespace ui {
+class PlatformEventSource;
+}
+
 namespace native_viewport {
 
 class NativeViewportApplicationDelegate
@@ -42,8 +47,10 @@ class NativeViewportApplicationDelegate
               mojo::InterfaceRequest<mojo::Gpu> request) override;
 
   scoped_refptr<gles2::GpuState> gpu_state_;
+  scoped_ptr<ui::PlatformEventSource> event_source_;
   bool is_headless_;
   mojo::TracingImpl tracing_;
+  mojo::AppLifetimeHelper app_lifetime_helper_;
 
   DISALLOW_COPY_AND_ASSIGN(NativeViewportApplicationDelegate);
 };