[Ozone-Demo] Fix surfaceless renderer

ui/ozone/demo/surfaceless_gl_renderer.h

 // 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.
 
 #ifndef UI_OZONE_DEMO_SURFACELESS_GL_RENDERER_H_
 #define UI_OZONE_DEMO_SURFACELESS_GL_RENDERER_H_
 
+#include "base/memory/weak_ptr.h"
 #include "ui/ozone/demo/gl_renderer.h"
 #include "ui/ozone/gpu/gpu_memory_buffer_factory_ozone_native_buffer.h"
 
 namespace gfx {
 class GLImage;
 }  // namespace gfx
 
 namespace ui {
 
 class SurfacelessGlRenderer : public GlRenderer {
  public:
   SurfacelessGlRenderer(gfx::AcceleratedWidget widget, const gfx::Size& size);
   ~SurfacelessGlRenderer() override;
 
   // Renderer:
   bool Initialize() override;
   void RenderFrame() override;
 
  private:
+  // Called by swap buffers when the actual swap finished.
+  void OnSwapBuffersAck();
+
   class BufferWrapper {
    public:
     BufferWrapper();
     ~BufferWrapper();
 
     bool Initialize(GpuMemoryBufferFactoryOzoneNativeBuffer* buffer_factory,
                     gfx::AcceleratedWidget widget,
                     const gfx::Size& size);
     void BindFramebuffer();
     void SchedulePlane();
 
    private:
     gfx::AcceleratedWidget widget_;
     gfx::Size size_;
 
     scoped_refptr<gfx::GLImage> image_;
     unsigned int gl_fb_;
     unsigned int gl_tex_;
   };
 
   GpuMemoryBufferFactoryOzoneNativeBuffer buffer_factory_;
   BufferWrapper buffers_[2];
   int back_buffer_;
+  bool is_swapping_buffers_;
+
+  base::WeakPtrFactory<SurfacelessGlRenderer> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(SurfacelessGlRenderer);
 };
 
 }  // namespace ui
 
 #endif  // UI_OZONE_DEMO_SURFACELESS_GL_RENDERER_H_