Take advantage of MojoGetBufferInformation

mojo/services/media/common/interfaces/media_transport.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_types.mojom";
 
@@ skipping 101 matching lines @@
   const uint64 kMaxBufferLen = 0x3FFFFFFFFFFFFFFF;
 
   // An enumeration used to indicate the ultimate fate of packets sent across
   // the pipe using the SendPacket method.
   enum SendResult {
     CONSUMED,  // Media was completely consumed.
     FLUSHED,   // Some or all of the media was flushed before being consumed.
   };
 
   // Sets the shared buffer in which packet payload will be located.
-  SetBuffer(handle<shared_buffer> buffer, uint64 size) => ();
+  SetBuffer(handle<shared_buffer> buffer) => ();
 
   // Sends a packet to the consumer. The callback signals that the consumer
   // is done with the packet buffer region.
   SendPacket(MediaPacket packet) => (SendResult result);
 
   // Primes the stream. The callback signals that the prime operation is
   // complete.
   Prime() => ();
 
   // Flushes the stream. The callback signals that the flush operation is
   // complete.
   Flush() => ();
 };