Use a separate NSView to draw browser composited content

content/browser/renderer_host/compositing_iosurface_mac.mm

 // Copyright (c) 2012 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 "content/browser/renderer_host/compositing_iosurface_mac.h"
 
 #include <OpenGL/CGLRenderers.h>
 #include <OpenGL/OpenGL.h>
 
 #include "base/bind.h"
@@ skipping 199 matching lines @@
   }
   for (int i = 0; i < num_outputs; ++i) {
     if (!pixel_buffers[i]) {
       glGenBuffersARB(1, &pixel_buffers[i]); CHECK_GL_ERROR();
     }
   }
 }
 
 
 // static
-CompositingIOSurfaceMac* CompositingIOSurfaceMac::Create() {
+scoped_refptr<CompositingIOSurfaceMac> CompositingIOSurfaceMac::Create() {
   IOSurfaceSupport* io_surface_support = IOSurfaceSupport::Initialize();
   if (!io_surface_support) {
     LOG(ERROR) << "No IOSurface support";
     return NULL;
   }
 
   scoped_refptr<CompositingIOSurfaceContext> offscreen_context =
       CompositingIOSurfaceContext::Get(
           CompositingIOSurfaceContext::kOffscreenContextWindowNumber);
   if (!offscreen_context) {
@@ skipping 757 matching lines @@
 }
 
 // static
 base::LazyInstance<CompositingIOSurfaceMac::EvictionQueue>
     CompositingIOSurfaceMac::eviction_queue_;
 
 // static
 bool CompositingIOSurfaceMac::eviction_scheduled_ = false;
 
 }  // namespace content