Mac: Add partial swap support to NSOpenGLContext path

ui/accelerated_widget_mac/io_surface_ns_gl_surface.h

 // Copyright 2015 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_ACCELERATED_WIDGET_MAC_IO_SURFACE_NS_GL_SURFACE_H_
 #define UI_ACCELERATED_WIDGET_MAC_IO_SURFACE_NS_GL_SURFACE_H_
 
 #include <Cocoa/Cocoa.h>
 #include <OpenGL/OpenGL.h>
 
 #include "base/mac/scoped_nsobject.h"
 #include "ui/accelerated_widget_mac/io_surface_context.h"
 #include "ui/accelerated_widget_mac/io_surface_texture.h"
 
 namespace ui {
 
 class IOSurfaceNSGLSurface {
  public:
   static IOSurfaceNSGLSurface* Create(NSView* view);
   ~IOSurfaceNSGLSurface();
 
   // Called on the UI thread.
   bool GotFrame(IOSurfaceID io_surface_id,
                 gfx::Size pixel_size,
-                float scale_factor);
+                float scale_factor,
+                gfx::Rect pixel_damage_rect);
 
  private:
   explicit IOSurfaceNSGLSurface(
       NSView* view,
       base::scoped_nsobject<NSOpenGLContext> ns_gl_context,
       scoped_refptr<ui::IOSurfaceTexture> iosurface);
   NSView* view_;
   scoped_refptr<ui::IOSurfaceTexture> iosurface_;
   base::scoped_nsobject<NSOpenGLContext> ns_gl_context_;
 };
 
 }  // namespace ui
 
 #endif  // UI_ACCELERATED_WIDGET_MAC_IO_SURFACE_NS_GL_SURFACE_H_