HW Video: Make media::VideoFrame handle the sync point of the compositor as well as webgl

media/base/video_frame.h

 // 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.
 
 #ifndef MEDIA_BASE_VIDEO_FRAME_H_
 #define MEDIA_BASE_VIDEO_FRAME_H_
 
 #include "base/callback.h"
 #include "base/md5.h"
 #include "base/memory/shared_memory.h"
+#include "base/synchronization/lock.h"
 #include "media/base/buffers.h"
 #include "ui/gfx/rect.h"
 #include "ui/gfx/size.h"
 
 class SkBitmap;
 
 namespace gpu {
 struct MailboxHolder;
 }  // namespace gpu
 
@@ skipping 194 matching lines @@
   // Returns true if this VideoFrame represents the end of the stream.
   bool end_of_stream() const { return end_of_stream_; }
 
   base::TimeDelta GetTimestamp() const {
     return timestamp_;
   }
   void SetTimestamp(const base::TimeDelta& timestamp) {
     timestamp_ = timestamp;
   }
 
+  // Set |release_sync_point_| which will be set to the mailbox holder
+  // when |mailbox_holder_release_cb_| is called so that the gpu video decoder
+  // waits for the sync point before reusing the mailbox.
+  // This method is thread safe. Both blink and compositor threads can call it.
+  // Multiple clients can set multiple sync points in one frame. It returns
+  // the previous sync point that other client set. The caller has
+  // responsibility for wait for the previous sync point of another client.
+  uint32 SwapReleaseSyncPoint(uint32 sync_point);
+
   // Used to keep a running hash of seen frames.  Expects an initialized MD5
   // context.  Calls MD5Update with the context and the contents of the frame.
   void HashFrameForTesting(base::MD5Context* context);
 
  private:
   friend class base::RefCountedThreadSafe<VideoFrame>;
   // Clients must use the static CreateFrame() method to create a new frame.
   VideoFrame(Format format,
              const gfx::Size& coded_size,
              const gfx::Rect& visible_rect,
@@ skipping 33 matching lines @@
   ReleaseMailboxCB mailbox_holder_release_cb_;
   ReadPixelsCB read_pixels_cb_;
 
   // Shared memory handle, if this frame was allocated from shared memory.
   base::SharedMemoryHandle shared_memory_handle_;
 
   base::Closure no_longer_needed_cb_;
 
   base::TimeDelta timestamp_;
 
+  base::Lock release_sync_point_lock_;
+  uint32 release_sync_point_;
+
   const bool end_of_stream_;
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(VideoFrame);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_BASE_VIDEO_FRAME_H_