Mac: Partially enable partial swap

content/common/gpu/image_transport_surface_calayer_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_CALAYER_MAC_H_
 #define CONTENT_COMMON_GPU_IMAGE_TRANSPORT_SURFACE_CALAYER_MAC_H_
 
 #include "base/mac/scoped_nsobject.h"
 #include "content/common/gpu/image_transport_surface_fbo_mac.h"
 #include "ui/base/cocoa/remote_layer_api.h"
@@ skipping 11 matching lines @@
  public:
   CALayerStorageProvider(ImageTransportSurfaceFBO* transport_surface);
   ~CALayerStorageProvider() 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 SwapBuffers(const gfx::Size& size, float scale_factor) override;
+  void FrameSizeChanged(
+      const gfx::Size& pixel_size, float scale_factor) override;
+  void SwapBuffers() override;
   void WillWriteToBackbuffer() override;
   void DiscardBackbuffer() override;
   void SwapBuffersAckedByBrowser(bool disable_throttling) override;
 
   // Interface to ImageTransportLayer:
   CGLContextObj LayerShareGroupContext();
   base::Closure LayerShareGroupContextDirtiedCallback();
   bool LayerCanDraw();
   void LayerDoDraw();
   void LayerResetStorageProvider();
@@ skipping 67 matching lines @@
 
   // Weak factory against which a timeout task for forcing a draw is created.
   base::WeakPtrFactory<CALayerStorageProvider> pending_draw_weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(CALayerStorageProvider);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_COMMON_GPU_IMAGE_TRANSPORT_SURFACE_CALAYER_MAC_H_