Cast: Implement log compression and

chrome/test/data/extensions/api_test/cast_streaming/bad_logging.js

 // Copyright 2014 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.
 
 var rtpStream = chrome.cast.streaming.rtpStream;
 var tabCapture = chrome.tabCapture;
 var udpTransport = chrome.cast.streaming.udpTransport;
 var createSession = chrome.cast.streaming.session.create;
 var pass = chrome.test.callbackPass;
 
 chrome.test.runTests([
   function emptyLogWithLoggingDisabled() {
 
     console.log("[TEST] emptyLogWithLoggingDisabled");
     tabCapture.capture({audio: true, video: true},
                        pass(function(stream) {
       console.log("Got MediaStream.");
       chrome.test.assertTrue(!!stream);
       createSession(stream.getAudioTracks()[0],
                     stream.getVideoTracks()[0],
                     pass(function(stream, audioId, videoId, udpId) {
         console.log("Starting.");
         var stateMachine = new TestStateMachine(stream,
                                                 audioId,
                                                 videoId,
                                                 udpId);
         var audioParams = rtpStream.getSupportedParams(audioId)[0];
         var videoParams = rtpStream.getSupportedParams(videoId)[0];
         var expectEmptyLogs = function(rawEvents) {
-          chrome.test.assertEq("", rawEvents);
+          chrome.test.assertEq(0, rawEvents.byteLength);
         }
         chrome.test.assertEq(audioParams.payload.codecName, "OPUS");
         chrome.test.assertEq(videoParams.payload.codecName, "VP8");
         udpTransport.setDestination(udpId,
                                     {address: "127.0.0.1", port: 2344});
         rtpStream.onStarted.addListener(
             stateMachine.onStarted.bind(stateMachine));
         stateMachine.onAllStarted =
             pass(function(audioId, videoId) {
           console.log("Getting logs without enabling logging.");
@@ skipping 17 matching lines @@
           chrome.test.assertEq(audioParams.payload.codecName, "OPUS");
           chrome.test.assertEq(videoParams.payload.codecName, "VP8");
           chrome.test.succeed();
         }.bind(null, stream, audioId, videoId, udpId));
         rtpStream.start(audioId, audioParams);
         rtpStream.start(videoId, videoParams);
       }.bind(null, stream)));
     }));
   },
 ]);