Monitor VideoResourceUpdater reusing destructed resource in Debug mode.

cc/resources/video_resource_updater.h

 // 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.
 
 #ifndef CC_RESOURCES_VIDEO_RESOURCE_UPDATER_H_
 #define CC_RESOURCES_VIDEO_RESOURCE_UPDATER_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 93 matching lines @@
     PlaneResource(unsigned resource_id,
                   const gfx::Size& resource_size,
                   ResourceFormat resource_format,
                   gpu::Mailbox mailbox);
   };
 
   static bool PlaneResourceMatchesUniqueID(const PlaneResource& plane_resource,
                                            const media::VideoFrame* video_frame,
                                            size_t plane_index);
 
-  static void SetPlaneResourceUniqueId(const media::VideoFrame* video_frame,
+  // Side effect: Marks in the userdata of the VideoFrame to prevent reusing the
+  // resource in the case that the original VideoFrame is destroyed and a new
+  // VideoFrame is re-created with the same pointer and the timestamps are not
+  // correctly set by the client.
+  static void SetPlaneResourceUniqueId(media::VideoFrame* video_frame,
                                        size_t plane_index,
                                        PlaneResource* plane_resource);
 
   // This needs to be a container where iterators can be erased without
   // invalidating other iterators.
   typedef std::list<PlaneResource> ResourceList;
   ResourceList::iterator AllocateResource(const gfx::Size& plane_size,
                                           ResourceFormat format,
                                           bool has_mailbox,
                                           bool immutable_hint);
@@ skipping 26 matching lines @@
   // Recycle resources so that we can reduce the number of allocations and
   // data transfers.
   ResourceList all_resources_;
 
   DISALLOW_COPY_AND_ASSIGN(VideoResourceUpdater);
 };
 
 }  // namespace cc
 
 #endif  // CC_RESOURCES_VIDEO_RESOURCE_UPDATER_H_