Motown: Delay audio track completion of Prime requests until a packet arrives.

services/media/common/media_pipe_base.cc

 // Copyright 2015 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 "base/logging.h"
 #include "services/media/common/media_pipe_base.h"
 
 namespace mojo {
 namespace media {
 
@@ skipping 119 matching lines @@
     DCHECK(packet->extra_payload);
     r = &packet->extra_payload[i++];
   }
 
   // Looks good, send this packet up to the implementation layer.
   MediaPacketStatePtr ptr(new MediaPacketState(packet.Pass(), buffer_, cbk));
   OnPacketReceived(std::move(ptr));
 }
 
 void MediaPipeBase::Prime(const PrimeCallback& cbk) {
-  cbk.Run();
+  OnPrimeRequested(cbk);
 }
 
 void MediaPipeBase::Flush(const FlushCallback& cbk) {
   // If we have not been successfully initialized, then we should not be getting
   // packets pushed to us.
   if (!buffer_) {
     LOG(ERROR) << "Flush called with no shared buffer established!";
     Reset();
     return;
   }
@@ skipping 55 matching lines @@
   if (MOJO_RESULT_OK != res) {
     LOG(ERROR) << "Failed to map shared buffer of size " << size_
                << " (res " << res << ")";
     DCHECK(base_ == nullptr);
     handle_.reset();
   }
 }
 
 }  // namespace media
 }  // namespace mojo