Motown: Add ActiveMultistreamSource model in preparation for the ffmpeg demux with async I/O

services/media/framework_mojo/mojo_producer.h

 // Copyright 2016 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 SERVICES_MEDIA_FRAMEWORK_MOJO_PUSH_PRODUCER_BASE_H_
 #define SERVICES_MEDIA_FRAMEWORK_MOJO_PUSH_PRODUCER_BASE_H_
 
 #include "base/single_thread_task_runner.h"
 #include "base/synchronization/lock.h"
-#include "base/task_runner.h"
 #include "mojo/common/binding_set.h"
 #include "mojo/services/media/common/interfaces/media_state.mojom.h"
 #include "mojo/services/media/common/interfaces/media_transport.mojom.h"
 #include "services/media/framework/models/active_sink.h"
 #include "services/media/framework_mojo/mojo_allocator.h"
 
 namespace mojo {
 namespace media {
 
 // Implements MediaProducer to forward a stream across mojo.
@@ skipping 69 matching lines @@
   // TODO(dalesat): Base this logic on presentation time or duration.
   uint32_t max_pushes_outstanding_ = 0;
   uint32_t current_pushes_outstanding_ = 0;
   // THE FIELDS ABOVE SHOULD ONLY BE ACCESSED WITH lock_ TAKEN.
 };
 
 }  // namespace media
 }  // namespace mojo
 
 #endif  // SERVICES_MEDIA_FRAMEWORK_MOJO_PUSH_PRODUCER_BASE_H_