Ensure that NativeViewport destructs correctly on Linux.

components/native_viewport/native_viewport_application_delegate.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef COMPONENTS_NATIVE_VIEWPORT_NATIVE_VIEWPORT_APPLICATION_DELEGATE_H_
 #define COMPONENTS_NATIVE_VIEWPORT_NATIVE_VIEWPORT_APPLICATION_DELEGATE_H_
 
 #include "base/macros.h"
 #include "components/gles2/gpu_impl.h"
 #include "components/native_viewport/public/interfaces/native_viewport.mojom.h"
 #include "mojo/application/public/cpp/application_delegate.h"
 #include "mojo/application/public/cpp/interface_factory_impl.h"
 #include "mojo/common/tracing_impl.h"
 
 namespace mojo {
 class ApplicationConnection;
 class ApplicationImpl;
 }
 
+namespace ui {
+class PlatformEventSource;
+}
+
 namespace native_viewport {
 
 class NativeViewportApplicationDelegate
     : public mojo::ApplicationDelegate,
       public mojo::InterfaceFactory<mojo::NativeViewport>,
       public mojo::InterfaceFactory<mojo::Gpu> {
  public:
   NativeViewportApplicationDelegate();
   ~NativeViewportApplicationDelegate() override;
 
  private:
   // mojo::ApplicationDelegate implementation.
   void Initialize(mojo::ApplicationImpl* application) override;
   bool ConfigureIncomingConnection(
       mojo::ApplicationConnection* connection) override;
 
   // mojo::InterfaceFactory<NativeViewport> implementation.
   void Create(mojo::ApplicationConnection* connection,
               mojo::InterfaceRequest<mojo::NativeViewport> request) override;
 
   // mojo::InterfaceFactory<Gpu> implementation.
   void Create(mojo::ApplicationConnection* connection,
               mojo::InterfaceRequest<mojo::Gpu> request) override;
 
   scoped_refptr<gles2::GpuState> gpu_state_;
+  scoped_ptr<ui::PlatformEventSource> event_source_;
   bool is_headless_;
   mojo::TracingImpl tracing_;
 
   DISALLOW_COPY_AND_ASSIGN(NativeViewportApplicationDelegate);
 };
 
 }  // namespace native_viewport
 
 #endif  // COMPONENTS_NATIVE_VIEWPORT_NATIVE_VIEWPORT_APPLICATION_DELEGATE_H_