Revert of Mustash: Ensure surfaces submitted to Mus by WM and embedders contain Surfaces with embeded content.

ui/aura/mus/client_surface_embedder.h

-// Copyright 2017 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 <memory>
-
-#include "base/macros.h"
-
-namespace cc {
-class SurfaceInfo;
-}
-
-namespace ui {
-class Layer;
-}
-
-namespace aura {
-
-class Window;
-
-// Used by WindowPortMus when it is embedding a client. Responsible for setting
-// up layers containing content from the client, parenting them to the window's
-// layer, and updating them when the client submits new surfaces.
-class ClientSurfaceEmbedder {
- public:
-  explicit ClientSurfaceEmbedder(Window* window);
-  ~ClientSurfaceEmbedder();
-
-  // Updates the surface layer and the clip layer based on the surface info.
-  void UpdateSurface(const cc::SurfaceInfo& surface_info);
-
- private:
-  // The window which embeds the client.
-  Window* window_;
-
-  // Contains the client's content.
-  std::unique_ptr<ui::Layer> surface_layer_;
-
-  // Used for clipping the surface layer to the window bounds.
-  std::unique_ptr<ui::Layer> clip_layer_;
-
-  DISALLOW_COPY_AND_ASSIGN(ClientSurfaceEmbedder);
-};
-
-}  // namespace aura