Speeding up TwoGetUserMediaAndStop WebRTC test

content/test/data/media/webrtc_test_utilities.js

 // Copyright (c) 2012 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.
 
 // These must match with how the video and canvas tags are declared in html.
 const VIDEO_TAG_WIDTH = 320;
 const VIDEO_TAG_HEIGHT = 240;
 
 // Fake video capture background green is of value 135.
 const COLOR_BACKGROUND_GREEN = 135;
@@ skipping 95 matching lines @@
 }
 
 function waitForBlackVideo(videoElement) {
   addExpectedEvent();
   detectBlackVideo(videoElement, function () { eventOccured(); });
 }
 
 // Calculates the current frame rate and compares to |expected_frame_rate|
 // |callback| is triggered with value |true| if the calculated frame rate
 // is +-1 the expected or |false| if five calculations fail to match
-// |expected_frame_rate|.
+// |expected_frame_rate|. Calls back with OK if the check passed, otherwise
+// an error message.
 function validateFrameRate(videoElementName, expected_frame_rate, callback) {
   var videoElement = $(videoElementName);
   var startTime = new Date().getTime();
   var decodedFrames = videoElement.webkitDecodedFrameCount;
   var attempts = 0;
 
   if (videoElement.readyState <= HTMLMediaElement.HAVE_CURRENT_DATA ||
           videoElement.paused || videoElement.ended) {
     failTest("getFrameRate - " + videoElementName + " is not plaing.");
     return;
   }
 
   var waitVideo = setInterval(function() {
     attempts++;
     currentTime = new Date().getTime();
     deltaTime = (currentTime - startTime) / 1000;
     startTime = currentTime;
 
     // Calculate decoded frames per sec.
     var fps =
         (videoElement.webkitDecodedFrameCount - decodedFrames) / deltaTime;
     decodedFrames = videoElement.webkitDecodedFrameCount;
 
     console.log('FrameRate in ' + videoElementName + ' is ' + fps);
     if (fps < expected_frame_rate + 1  && fps > expected_frame_rate - 1) {
       clearInterval(waitVideo);
-      callback(true);
+      callback('OK');
     } else if (attempts == 5) {
       clearInterval(waitVideo);
-      callback(false);
+      callback('Expected frame rate ' + expected_frame_rate + ' for ' +
+               'element ' + videoElementName + ', but got ' + fps);
     }
   }, 1000);
 }
 
 function waitForConnectionToStabilize(peerConnection, callback) {
   peerConnection.onsignalingstatechange = function(event) {
     if (peerConnection.signalingState == 'stable') {
       peerConnection.onsignalingstatechange = null;
       callback();
     }
@@ skipping 47 matching lines @@
     failTest("expected '" + expected + "', got '" + actual + "'.");
   }
 }
 
 function assertNotEquals(expected, actual) {
   if (actual === expected) {
     failTest("expected '" + expected + "', got '" + actual + "'.");
   }
 }