Add a headless configuration to Mojo's native viewport service

mojo/services/native_viewport/native_viewport_impl.h

 // Copyright 2014 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_IMPL_H_
 #define MOJO_SERVICES_NATIVE_VIEWPORT_IMPL_H_
 
 #include "base/memory/weak_ptr.h"
 #include "cc/surfaces/surface_id.h"
 #include "mojo/services/native_viewport/platform_viewport.h"
 #include "mojo/services/public/interfaces/gpu/gpu.mojom.h"
 #include "mojo/services/public/interfaces/native_viewport/native_viewport.mojom.h"
 #include "mojo/services/public/interfaces/surfaces/surfaces_service.mojom.h"
 #include "ui/gfx/geometry/rect.h"
 
 namespace ui {
 class Event;
 }
 
 namespace mojo {
 class ApplicationImpl;
 class ViewportSurface;
 
 class NativeViewportImpl : public InterfaceImpl<NativeViewport>,
                            public PlatformViewport::Delegate {
  public:
-  explicit NativeViewportImpl(ApplicationImpl* app);
+  explicit NativeViewportImpl(ApplicationImpl* app,

[jamesr, 2014/09/25 22:18:14]

you can drop 'explicit' now that it's 2 args (and we don't support initializer
list syntax...yet)

+                              bool is_headless);
   virtual ~NativeViewportImpl();
 
   // InterfaceImpl<NativeViewport> implementation.
   virtual void Create(SizePtr bounds) OVERRIDE;
   virtual void Show() OVERRIDE;
   virtual void Hide() OVERRIDE;
   virtual void Close() OVERRIDE;
   virtual void SetBounds(SizePtr bounds) OVERRIDE;
   virtual void SubmittedFrame(SurfaceIdPtr surface_id) OVERRIDE;
 
   // PlatformViewport::Delegate implementation.
   virtual void OnBoundsChanged(const gfx::Rect& bounds) OVERRIDE;
   virtual void OnAcceleratedWidgetAvailable(
       gfx::AcceleratedWidget widget) OVERRIDE;
   virtual bool OnEvent(ui::Event* ui_event) OVERRIDE;
   virtual void OnDestroyed() OVERRIDE;
 
   void AckEvent();
 
  private:
+  bool is_headless_;
   scoped_ptr<PlatformViewport> platform_viewport_;
   scoped_ptr<ViewportSurface> viewport_surface_;
   uint64_t widget_id_;
   gfx::Rect bounds_;
   GpuPtr gpu_service_;
   SurfacesServicePtr surfaces_service_;
   cc::SurfaceId child_surface_id_;
   bool waiting_for_event_ack_;
   base::WeakPtrFactory<NativeViewportImpl> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(NativeViewportImpl);
 };
 
 }  // namespace mojo
 
 #endif  // MOJO_SERVICES_NATIVE_VIEWPORT_IMPL_H_