Fix ChunkDemuxer seek deadlock

media/filters/gpu_video_decoder.cc

 // 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 "media/filters/gpu_video_decoder.h"
 
 #include "base/bind.h"
 #include "base/message_loop.h"
 #include "base/stl_util.h"
 #include "media/base/demuxer_stream.h"
@@ skipping 206 matching lines @@
 }
 
 void GpuVideoDecoder::RequestBufferDecode(const scoped_refptr<Buffer>& buffer) {
   if (!gvd_loop_proxy_->BelongsToCurrentThread()) {
     gvd_loop_proxy_->PostTask(FROM_HERE, base::Bind(
         &GpuVideoDecoder::RequestBufferDecode, this, buffer));
     return;
   }
   demuxer_read_in_progress_ = false;
 
+  if (!buffer) {
+    if (pending_read_cb_.is_null())
+      return;
+
+    gvd_loop_proxy_->PostTask(FROM_HERE, base::Bind(
+        pending_read_cb_, scoped_refptr<VideoFrame>()));
+    pending_read_cb_.Reset();
+    return;
+  }
+
   if (!vda_) {
     EnqueueFrameAndTriggerFrameDelivery(VideoFrame::CreateEmptyFrame());
     return;
   }
 
   if (buffer->IsEndOfStream()) {
     if (state_ == kNormal) {
       state_ = kDrainingDecoder;
       render_loop_proxy_->PostTask(FROM_HERE, base::Bind(
           &VideoDecodeAccelerator::Flush, vda_));
@@ skipping 279 matching lines @@
         &GpuVideoDecoder::NotifyError, this, error));
     return;
   }
   vda_ = NULL;
   DLOG(ERROR) << "VDA Error: " << error;
   if (host())
     host()->SetError(PIPELINE_ERROR_DECODE);
 }
 
 }  // namespace media