Revert of Mus+Ash: propagate Surface ID to parents

services/ui/public/cpp/surface_id_handler.h

-// Copyright 2016 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 SERVICES_UI_PUBLIC_CPP_SURFACE_ID_HANDLER_H_
-#define SERVICES_UI_PUBLIC_CPP_SURFACE_ID_HANDLER_H_
-
-#include "cc/surfaces/surface_id.h"
-#include "cc/surfaces/surface_sequence.h"
-#include "ui/gfx/geometry/size.h"
-
-namespace ui {
-
-class Window;
-
-// Holds information about the current surface held by a Window.
-// |surface_id| uniquely identifies the surface in the display
-// compositor.
-// |surface_sequence| is a reference to the surface to retain
-// this surface even after a new surface has been created.
-// |frame_size| is the size of the frame held by the surface.
-// |device_scale_factor| is the scale factor that the frame was
-// renderered for.
-struct SurfaceInfo {
-  cc::SurfaceId surface_id;
-  cc::SurfaceSequence surface_sequence;
-  gfx::Size frame_size;
-  float device_scale_factor;
-};
-
-class SurfaceIdHandler {
- public:
-  // Called when a child window allocates a new surface ID.
-  // If the handler wishes to retain ownership of the |surface_info|,
-  // it can move it. If a child's surface has been cleared then
-  // |surface_info| will refer to a null pointer.
-  virtual void OnChildWindowSurfaceChanged(
-      Window* window,
-      std::unique_ptr<SurfaceInfo>* surface_info) = 0;
-};
-
-}  // namespace ui
-
-#endif  // SERVICES_UI_PUBLIC_CPP_SURFACE_ID_HANDLER_H_