Add an additional VDA::Flush() mode to return all allocated buffers.

content/common/gpu/media/fake_video_decode_accelerator.cc

 // Copyright 2014 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/common/gpu/media/fake_video_decode_accelerator.h"
 
 #include <stddef.h>
 #include <string.h>
 
 #include "base/bind.h"
@@ skipping 121 matching lines @@
                             weak_this_factory_.GetWeakPtr()));
 }
 
 void FakeVideoDecodeAccelerator::ReusePictureBuffer(int32_t picture_buffer_id) {
   free_output_buffers_.push(picture_buffer_id);
   child_task_runner_->PostTask(
       FROM_HERE, base::Bind(&FakeVideoDecodeAccelerator::DoPictureReady,
                             weak_this_factory_.GetWeakPtr()));
 }
 
-void FakeVideoDecodeAccelerator::Flush() {
+void FakeVideoDecodeAccelerator::Flush(bool return_buffers) {

[kcwu, 2016/03/22 09:47:42]

how about adding DCHECK(!return_buffers) for VDAs which don't support it?

   flushing_ = true;
   child_task_runner_->PostTask(
       FROM_HERE, base::Bind(&FakeVideoDecodeAccelerator::DoPictureReady,
                             weak_this_factory_.GetWeakPtr()));
 }
 
 void FakeVideoDecodeAccelerator::Reset() {
   while (!queued_bitstream_ids_.empty()) {
     client_->NotifyEndOfBitstreamBuffer(queued_bitstream_ids_.front());
     queued_bitstream_ids_.pop();
@@ skipping 33 matching lines @@
     // Bitstream no longer needed.
     client_->NotifyEndOfBitstreamBuffer(bitstream_id);
     if (flushing_ && queued_bitstream_ids_.empty()) {
       flushing_ = false;
       client_->NotifyFlushDone();
     }
   }
 }
 
 }  // namespace content