Add a headless configuration to Mojo's native viewport service

mojo/services/native_viewport/platform_viewport_stub.cc

-// Copyright 2013 The Chromium Authors. All rights reserved.
+// 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.
 
-#include "mojo/services/native_viewport/platform_viewport.h"
-
-// Stub to build on platforms we don't fully support yet.
+#include "mojo/services/native_viewport/platform_viewport_headless.h"
 
 namespace mojo {
 
-class PlatformViewportStub : public PlatformViewport {
- public:
-  PlatformViewportStub(Delegate* delegate) : delegate_(delegate) {
-  }
-  virtual ~PlatformViewportStub() {
-  }
-
- private:
-  // Overridden from PlatformViewport:
-  virtual void Init() OVERRIDE {
-  }
-  virtual void Show() OVERRIDE {
-  }
-  virtual void Hide() OVERRIDE {
-  }
-  virtual void Close() OVERRIDE {
-    delegate_->OnDestroyed();
-  }
-  virtual gfx::Size GetSize() OVERRIDE {
-    return gfx::Size();
-  }
-  virtual void SetBounds(const gfx::Rect& bounds) OVERRIDE {
-  }
-
-  Delegate* delegate_;
-
-  DISALLOW_COPY_AND_ASSIGN(PlatformViewportStub);
-};
-
 // static
 scoped_ptr<PlatformViewport> PlatformViewport::Create(Delegate* delegate) {
-  return scoped_ptr<PlatformViewport>(
-      new PlatformViewportStub(delegate)).Pass();
+  return PlatformViewportHeadless::Create(delegate);
 }
 
 }  // namespace mojo