Now catches the error message from RTCPeerConnection and createAnswer/Offer

chrome/test/data/webrtc/peerconnection.js

Index: chrome/test/data/webrtc/peerconnection.js
diff --git a/chrome/test/data/webrtc/peerconnection.js b/chrome/test/data/webrtc/peerconnection.js
index f642da997ec538cde313491380347b87a1e5f3a5..6360c660ac1d60baa1824ab26814851498e98568 100644
--- a/chrome/test/data/webrtc/peerconnection.js
+++ b/chrome/test/data/webrtc/peerconnection.js
@@ -83,7 +83,7 @@ function receiveOfferFromPeer(sessionDescJson, constraints) {
   peerConnection_().setRemoteDescription(
       sessionDescription,
       function() { success_('setRemoteDescription'); },
-      function() { failure_('setRemoteDescription'); });
+      function(error) { failure_('setRemoteDescription', error); });
 
   peerConnection_().createAnswer(
       function(answer) {
@@ -91,7 +91,7 @@ function receiveOfferFromPeer(sessionDescJson, constraints) {
         setLocalDescription(peerConnection, answer);
         returnToTest('ok-' + JSON.stringify(answer));
       },
-      function() { failure_('createAnswer'); },
+      function(error) { failure_('createAnswer', error); },
       constraints);
 }
 
@@ -118,7 +118,7 @@ function receiveAnswerFromPeer(sessionDescJson) {
         success_('setRemoteDescription');
         returnToTest('ok-accepted-answer');
       },
-      function() { failure_('setRemoteDescription'); });
+      function(error) { failure_('setRemoteDescription', error); });
 }
 
 /**
@@ -260,7 +260,7 @@ function success_(method) {
 
 /** @private */
 function failure_(method, error) {
-  throw failTest(method + '() failed: ' + error);
+  throw failTest(method + '() failed: ' + JSON.stringify(error);
 }
 
 /** @private */
@@ -278,7 +278,7 @@ function setLocalDescription(peerConnection, sessionDescription) {
   peerConnection.setLocalDescription(
     sessionDescription,
     function() { success_('setLocalDescription'); },
-    function() { failure_('setLocalDescription'); });
+    function(error) { failure_('setLocalDescription', error); });
 }
 
 /** @private */