Add promise-based addIceCandidate, setLocalDescription and setRemoteDescription to RTCPeerConnection

third_party/WebKit/LayoutTests/fast/mediastream/RTCPeerConnection-localDescription.html

Index: third_party/WebKit/LayoutTests/fast/mediastream/RTCPeerConnection-localDescription.html
diff --git a/third_party/WebKit/LayoutTests/fast/mediastream/RTCPeerConnection-localDescription.html b/third_party/WebKit/LayoutTests/fast/mediastream/RTCPeerConnection-localDescription.html
index a8987914665129244a44fbb560021f856629ebcc..4f9a85d99e7c4ce54b308bb7698dcad5165c1684 100644
--- a/third_party/WebKit/LayoutTests/fast/mediastream/RTCPeerConnection-localDescription.html
+++ b/third_party/WebKit/LayoutTests/fast/mediastream/RTCPeerConnection-localDescription.html
@@ -42,12 +42,24 @@ function requestSucceeded1()
     shouldNotThrow('pc.setLocalDescription(sessionDescription, requestSucceeded2, requestFailed2);');
 }
 
+function expectedTypeError(error)
+{
+    errorReason = error;
+    shouldBe('errorReason.name', '"TypeError"')
+    testPassed('expectedTypeError was called.')
+}
+
+function expectedInvalidSessionDescription(error)
+{
+    testPassed('expectedInvalidSessionDescription was called.')
+}
+
 pc = new webkitRTCPeerConnection(null, null);
-shouldThrow('pc.setLocalDescription(null)');
+shouldNotThrow('pc.setLocalDescription().catch(expectedTypeError)');
+shouldNotThrow('pc.setLocalDescription(null).catch(expectedInvalidSessionDescription)');
 var sessionDescription = new RTCSessionDescription({type:"offer", sdp:"local"});
 shouldNotThrow('pc.setLocalDescription(sessionDescription, requestSucceeded1, requestFailed1);');
 
-
 window.jsTestIsAsync = true;
 window.successfullyParsed = true;
 </script>