cc: Make OutputSurface::SwapBuffers pure virtual

mojo/examples/compositor_app/compositor_host.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 MOJO_EXAMPLES_COMPOSITOR_APP_COMPOSITOR_HOST_H_
-#define MOJO_EXAMPLES_COMPOSITOR_APP_COMPOSITOR_HOST_H_
-
-#include "base/memory/scoped_ptr.h"
-#include "base/threading/thread.h"
-#include "cc/trees/layer_tree_host_client.h"
-#include "mojo/public/cpp/system/core.h"
-#include "ui/gfx/size.h"
-
-namespace cc {
-class Layer;
-class LayerTreeHost;
-}  // namespace cc
-
-namespace mojo {
-namespace examples {
-class GLES2ClientImpl;
-
-class CompositorHost : public cc::LayerTreeHostClient {
- public:
-  explicit CompositorHost(ScopedMessagePipeHandle command_buffer_handle);
-  virtual ~CompositorHost();
-
-  void SetSize(const gfx::Size& viewport_size);
-
-  // cc::LayerTreeHostClient implementation.
-  virtual void WillBeginMainFrame(int frame_id) override;
-  virtual void DidBeginMainFrame() override;
-  virtual void BeginMainFrame(const cc::BeginFrameArgs& args) override;
-  virtual void Layout() override;
-  virtual void ApplyViewportDeltas(const gfx::Vector2d& inner_delta,
-                                   const gfx::Vector2d& outer_delta,
-                                   float page_scale,
-                                   float top_controls_delta) override;
-  virtual void ApplyViewportDeltas(const gfx::Vector2d& scroll_delta,
-                                   float page_scale,
-                                   float top_controls_delta) override;
-  virtual void RequestNewOutputSurface(bool fallback) override;
-  virtual void DidInitializeOutputSurface() override;
-  virtual void WillCommit() override;
-  virtual void DidCommit() override;
-  virtual void DidCommitAndDrawFrame() override;
-  virtual void DidCompleteSwapBuffers() override;
-
- private:
-  void SetupScene();
-
-  ScopedMessagePipeHandle command_buffer_handle_;
-  scoped_ptr<cc::LayerTreeHost> tree_;
-  scoped_refptr<cc::Layer> child_layer_;
-  base::Thread compositor_thread_;
-};
-
-}  // namespace examples
-}  // namespace mojo
-
-#endif  // MOJO_EXAMPLES_COMPOSITOR_APP_COMPOSITOR_HOST_H_