Mac: Always use surfaceless mode

content/common/gpu/image_transport_surface_iosurface_mac.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 CONTENT_COMMON_GPU_IMAGE_TRANSPORT_SURFACE_IOSURFACE_MAC_H_
-#define CONTENT_COMMON_GPU_IMAGE_TRANSPORT_SURFACE_IOSURFACE_MAC_H_
-
-#include <list>
-
-#include "content/common/gpu/image_transport_surface_fbo_mac.h"
-
-#include <IOSurface/IOSurface.h>
-// Note that this must be included after gl_bindings.h to avoid conflicts.
-#include <OpenGL/CGLIOSurface.h>
-
-namespace content {
-
-// Allocate IOSurface-backed storage for an FBO image transport surface.
-class IOSurfaceStorageProvider
-    : public ImageTransportSurfaceFBO::StorageProvider {
- public:
-  IOSurfaceStorageProvider(ImageTransportSurfaceFBO* transport_surface);
-  ~IOSurfaceStorageProvider() override;
-
-  // ImageTransportSurfaceFBO::StorageProvider implementation:
-  gfx::Size GetRoundedSize(gfx::Size size) override;
-  bool AllocateColorBufferStorage(
-      CGLContextObj context, const base::Closure& context_dirtied_callback,
-      GLuint texture, gfx::Size pixel_size, float scale_factor) override;
-  void FreeColorBufferStorage() override;
-  void FrameSizeChanged(
-      const gfx::Size& pixel_size, float scale_factor) override;
-  void SwapBuffers(const gfx::Rect& dirty_rect) override;
-  void WillWriteToBackbuffer() override;
-  void DiscardBackbuffer() override;
-  void SwapBuffersAckedByBrowser(bool disable_throttling) override;
-
- private:
-  ImageTransportSurfaceFBO* transport_surface_;
-
-  base::ScopedCFTypeRef<IOSurfaceRef> io_surface_;
-  gfx::Size frame_pixel_size_;
-  float frame_scale_factor_;
-
-  // The list of IOSurfaces that have been sent to the browser process but have
-  // not been opened in the browser process yet. This list should never have
-  // more than one entry.
-  std::list<base::ScopedCFTypeRef<IOSurfaceRef>> pending_swapped_surfaces_;
-
-  // The id of |io_surface_| or 0 if that's NULL.
-  IOSurfaceID io_surface_id_;
-
-  DISALLOW_COPY_AND_ASSIGN(IOSurfaceStorageProvider);
-};
-
-}  // namespace content
-
-#endif  // CONTENT_COMMON_GPU_IMAGE_TRANSPORT_SURFACE_IOSURFACE_MAC_H_