mojo_shell crashes on Linux

mojo/services/native_viewport/native_viewport.h

 // Copyright 2013 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 MOJO_SERVICES_NATIVE_VIEWPORT_NATIVE_VIEWPORT_H_
 #define MOJO_SERVICES_NATIVE_VIEWPORT_NATIVE_VIEWPORT_H_
 
 #include "base/memory/scoped_ptr.h"
 #include "ui/gfx/native_widget_types.h"
 #include "ui/gfx/size.h"
@@ skipping 18 matching lines @@
   virtual bool OnEvent(ui::Event* event) = 0;
   virtual void OnDestroyed() = 0;
 };
 
 // Encapsulation of platform-specific Viewport.
 class NativeViewport {
  public:
   virtual ~NativeViewport() {}
 
   virtual gfx::Size GetSize() = 0;
+  virtual void Init() = 0;
   virtual void Close() = 0;
 
   static scoped_ptr<NativeViewport> Create(shell::Context* context,
                                            NativeViewportDelegate* delegate);
 };
 
 }  // namespace services
 }  // namespace mojo
 
 #endif  // MOJO_SERVICES_NATIVE_VIEWPORT_NATIVE_VIEWPORT_H_