Mac Overlays: Wire up overlays on Mac

ui/gl/gl_image_io_surface.mm

 // Copyright 2013 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.
 
 #include "ui/gl/gl_image_io_surface.h"
 
+#include "base/mac/foundation_util.h"
 #include "ui/gl/gl_bindings.h"
 #include "ui/gl/gl_context.h"
 
 // Note that this must be included after gl_bindings.h to avoid conflicts.
+#include <Quartz/Quartz.h>
 #include <OpenGL/CGLIOSurface.h>
 
 namespace gfx {
 namespace {
 
 bool ValidInternalFormat(unsigned internalformat) {
   switch (internalformat) {
     case GL_R8:
     case GL_BGRA_EXT:
       return true;
@@ skipping 164 matching lines @@
                                        const Point& offset,
                                        const Rect& rect) {
   return false;
 }
 
 bool GLImageIOSurface::ScheduleOverlayPlane(gfx::AcceleratedWidget widget,
                                             int z_order,
                                             OverlayTransform transform,
                                             const Rect& bounds_rect,
                                             const RectF& crop_rect) {
-  return false;
+  // Note that gfx::AcceleratedWidget does not actually map to CALayer in this
+  // context. It may be that the types should coincide.
+  CALayer* layer = base::mac::ObjCCastStrict<CALayer>(widget);
+
+  // Also note that transactions are not disabled. The caller must ensure that
+  // all changes to the CALayer tree happen atomically.
+  [layer setContents:(id)io_surface_.get()];

[Andre, 2015/07/22 21:34:36]

Style guide prohibits C style casts.

[ccameron, 2015/07/23 05:33:02]

Changed to static_cast<id>.

+  [layer setFrame:bounds_rect.ToCGRect()];
+  return true;
 }
 
 }  // namespace gfx