Motown: Use new TimelineTransform and related definitions

mojo/services/media/audio/interfaces/audio_track.mojom

 // 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.
 
 [DartPackage="mojo_services"]
 module mojo.media;
 
 import "mojo/services/media/common/interfaces/media_common.mojom";
 import "mojo/services/media/common/interfaces/media_transport.mojom";
 import "mojo/services/media/common/interfaces/media_types.mojom";
-import "mojo/services/media/common/interfaces/rate_control.mojom";
+import "mojo/services/media/core/interfaces/timeline_controller.mojom";
 
 struct AudioTrackDescriptor {
   // The track supports the union of all these media type sets.
   array<MediaTypeSet> supported_media_types;
 };
 
 struct AudioTrackConfiguration {
   // The media type to use.
   MediaType media_type;
 
@@ skipping 21 matching lines @@
 
   // The maximum permitted above-unity gain.
   const float kMaxGain = 20.0;
 
   // Get the descriptor.
   Describe() => (AudioTrackDescriptor descriptor);
 
   // Set the configuration, receive a pipe to send data to in return.
   Configure(AudioTrackConfiguration configuration, MediaConsumer& pipe);
 
-  // Request the rate control interface for this AudioTrack
-  GetRateControl(RateControl& rate_control);
+  // Request the timeline control site for this AudioTrack
+  GetTimelineControlSite(MediaTimelineControlSite& timeline_control_site);
 
   // Sets the current gain/attenuation of the track, expressed in dB.  Legal
   // values are in the range [-inf, 20.0].  Any value less than or equal to the
   // constant kMutedGain will result in the track becoming explicitly muted
   // (regardless of its underlying resolution or intensity).
   SetGain(float db_gain);
 };