Mac: Add partial swap support to NSOpenGLContext path

content/common/gpu/image_transport_surface_fbo_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_FBO_MAC_H_
 #define CONTENT_COMMON_GPU_IMAGE_TRANSPORT_SURFACE_FBO_MAC_H_
 
 #include "base/mac/scoped_cftyperef.h"
 #include "base/memory/scoped_ptr.h"
 #include "content/common/gpu/gpu_command_buffer_stub.h"
@@ skipping 115 matching lines @@
   gfx::Size pixel_size_;
   gfx::Size rounded_pixel_size_;
   float scale_factor_;
 
   // Whether or not we've successfully made the surface current once.
   bool made_current_;
 
   // Whether a SwapBuffers IPC needs to be sent to the browser.
   bool is_swap_buffers_send_pending_;
   std::vector<ui::LatencyInfo> latency_info_;
+  gfx::Rect pending_swap_pixel_damage_rect_;
 
   scoped_ptr<ImageTransportHelper> helper_;
 
   DISALLOW_COPY_AND_ASSIGN(ImageTransportSurfaceFBO);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_COMMON_GPU_IMAGE_TRANSPORT_SURFACE_FBO_MAC_H_