Cast: Clarify the unit of bitrate

chrome/common/extensions/api/cast_streaming_rtp_stream.idl

 // Copyright 2013 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.
 
 // The <code>chrome.cast.streaming.rtpStream</code> API allows configuration
 // of encoding parameters and RTP parameters used in a Cast streaming
 // session.
 namespace cast.streaming.rtpStream {
   // Params for audio and video codec.
   dictionary CodecSpecificParams {
     DOMString key;
     DOMString value;
   };
 
   // RTP payload param.
   dictionary RtpPayloadParams {
     long payloadType;
 
     DOMString codecName;
 
     // Synchronization source identifier.
     long? ssrc;
 
     long? feedbackSsrc;
 
     long? clockRate;
 
+    // Minimum bitrate in kilobits per second.
     long? minBitrate;
 
+    // Maximum bitrate in kilobits per second.
     long? maxBitrate;
 
     // The number of channels.
     long? channels;
 
     // Video width in pixels.
     long? width;
 
     // Video height in pixels.
     long? height;
@@ skipping 79 matching lines @@
     // Event fired when a Cast RTP stream has stopped.
     // |streamId| : The ID of the RTP stream.
     static void onStopped(long streamId);
 
     // Event fired when a Cast RTP stream has error.
     // |streamId| : The ID of the RTP stream.
     // |errorString| : The error info.
     static void onError(long streamId, DOMString errorString);
   };
 };