Revert of Mandoline: Remove native_viewport.mojom

components/view_manager/native_viewport/platform_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 COMPONENTS_VIEW_MANAGER_NATIVE_VIEWPORT_PLATFORM_VIEWPORT_H_
 #define COMPONENTS_VIEW_MANAGER_NATIVE_VIEWPORT_PLATFORM_VIEWPORT_H_
 
 #include "base/memory/scoped_ptr.h"
+#include "components/view_manager/public/interfaces/native_viewport.mojom.h"
 #include "ui/gfx/geometry/size.h"
 #include "ui/gfx/native_widget_types.h"
 #include "ui/mojo/events/input_events.mojom.h"
 
 namespace gfx {
 class Rect;
 }
 
 namespace native_viewport {
 
 // Encapsulation of platform-specific Viewport.
 class PlatformViewport {
  public:
   class Delegate {
    public:
     virtual ~Delegate() {}
 
+    virtual void OnMetricsChanged(mojo::ViewportMetricsPtr metrics) = 0;
     virtual void OnAcceleratedWidgetAvailable(gfx::AcceleratedWidget widget,
                                               float device_pixel_ratio) = 0;
     virtual void OnAcceleratedWidgetDestroyed() = 0;
+    virtual bool OnEvent(mojo::EventPtr event) = 0;
     virtual void OnDestroyed() = 0;
-    virtual void OnEvent(mojo::EventPtr event) = 0;
-    virtual void OnMetricsChanged(const gfx::Size& size,
-                                  float device_scale_factor) = 0;
   };
 
   virtual ~PlatformViewport() {}
 
   virtual void Init(const gfx::Rect& bounds) = 0;
   virtual void Show() = 0;
   virtual void Hide() = 0;
   virtual void Close() = 0;
   virtual gfx::Size GetSize() = 0;
   virtual void SetBounds(const gfx::Rect& bounds) = 0;
 
-  static scoped_ptr<PlatformViewport> Create(Delegate* delegate, bool headless);
+  static scoped_ptr<PlatformViewport> Create(Delegate* delegate);
 };
 
 }  // namespace native_viewport
 
 #endif  // COMPONENTS_VIEW_MANAGER_NATIVE_VIEWPORT_PLATFORM_VIEWPORT_H_