Make WebRtcWebcamBrowserTest fail faster.

chrome/test/data/webrtc/getusermedia.js

Index: chrome/test/data/webrtc/getusermedia.js
diff --git a/chrome/test/data/webrtc/getusermedia.js b/chrome/test/data/webrtc/getusermedia.js
index 4307e60609e84321f4f1174f87497e6a68cb243e..b1af4944553918ceea8262b6929253db6bc5fc64 100644
--- a/chrome/test/data/webrtc/getusermedia.js
+++ b/chrome/test/data/webrtc/getusermedia.js
@@ -54,7 +54,8 @@ function doGetUserMedia(constraints) {
     returnToTest('Browser does not support WebRTC.');
     return;
   }
-  debug('Requesting doGetUserMedia: constraints: ' + constraints);
+  debug('Requesting doGetUserMedia: constraints: ' +
+        JSON.stringify(constraints, null, 0).replace(/[\r\n]/g, ''));
   getUserMedia(constraints,
                function(stream) {
                  ensureGotAllExpectedStreams_(stream, constraints);
@@ -73,7 +74,10 @@ function doGetUserMedia(constraints) {
  */
 function obtainGetUserMediaResult() {
   returnToTest(gRequestWebcamAndMicrophoneResult);
-  return gRequestWebcamAndMicrophoneResult;
+  var ret = gRequestWebcamAndMicrophoneResult;
+  // Reset for the next call.
+  gRequestWebcamAndMicrophoneResult = 'not-called-yet';

[tommi (sloooow) - chröme, 2015/04/26 10:55:02]

The problem we were hitting here is that when doing two gUM calls in a row, the
script would return the result from the first run for the second call.

[phoglund_chromium, 2015/04/27 07:46:48]

Good catch. It's possible the re-set should actually be in doGetUserMedia, but I
think the calling code doesn't rely on getting the same answer several times.

+  return ret;
 }
 
 /**