mac: Use IOSurfaces in Canvas2DLayerBridge.

cc/resources/resource_provider.cc

 // Copyright 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 "cc/resources/resource_provider.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <algorithm>
@@ skipping 576 matching lines @@
 ResourceId ResourceProvider::CreateResourceFromTextureMailbox(
     const TextureMailbox& mailbox,
     scoped_ptr<SingleReleaseCallbackImpl> release_callback_impl,
     bool read_lock_fences_enabled) {
   DCHECK(thread_checker_.CalledOnValidThread());
   // Just store the information. Mailbox will be consumed in LockForRead().
   ResourceId id = next_id_++;
   DCHECK(mailbox.IsValid());
   Resource* resource = nullptr;
   if (mailbox.IsTexture()) {
+    gfx::Size size =
+        mailbox.is_overlay_candidate() ? mailbox.size_in_pixels() : gfx::Size();
     resource = InsertResource(
         id,
-        Resource(0, gfx::Size(), Resource::EXTERNAL, mailbox.target(),
+        Resource(0, size, Resource::EXTERNAL, mailbox.target(),
                  mailbox.nearest_neighbor() ? GL_NEAREST : GL_LINEAR,
                  TEXTURE_HINT_IMMUTABLE, RESOURCE_TYPE_GL_TEXTURE, RGBA_8888));
   } else {
     DCHECK(mailbox.IsSharedMemory());
     SharedBitmap* shared_bitmap = mailbox.shared_bitmap();
     uint8_t* pixels = shared_bitmap->pixels();
     DCHECK(pixels);
     resource = InsertResource(
         id, Resource(pixels, shared_bitmap, mailbox.size_in_pixels(),
                      Resource::EXTERNAL, GL_LINEAR));
@@ skipping 1349 matching lines @@
 
     const int kImportance = 2;
     pmd->CreateSharedGlobalAllocatorDump(guid);
     pmd->AddOwnershipEdge(dump->guid(), guid, kImportance);
   }
 
   return true;
 }
 
 }  // namespace cc