Add promise-based addIceCandidate, setLocalDescription and setRemoteDescription to RTCPeerConnection

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

Index: third_party/WebKit/LayoutTests/fast/mediastream/RTCPeerConnection-remoteDescription.html
diff --git a/third_party/WebKit/LayoutTests/fast/mediastream/RTCPeerConnection-remoteDescription.html b/third_party/WebKit/LayoutTests/fast/mediastream/RTCPeerConnection-remoteDescription.html
index af224ebff6b203ec8e506566a954933244725e44..b1045b248dfa97287c43f504cfdbdee007b518f4 100644
--- a/third_party/WebKit/LayoutTests/fast/mediastream/RTCPeerConnection-remoteDescription.html
+++ b/third_party/WebKit/LayoutTests/fast/mediastream/RTCPeerConnection-remoteDescription.html
@@ -42,12 +42,24 @@ function requestSucceeded1()
     shouldNotThrow('pc.setRemoteDescription(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.setRemoteDescription(null)');
+shouldNotThrow('pc.setRemoteDescription().catch(expectedTypeError)');
+shouldNotThrow('pc.setRemoteDescription(null).catch(expectedInvalidSessionDescription)');
 var sessionDescription = new RTCSessionDescription({type:"answer", sdp:"remote"});
 shouldNotThrow('pc.setRemoteDescription(sessionDescription, requestSucceeded1, requestFailed1);');
 
-
 window.jsTestIsAsync = true;
 window.successfullyParsed = true;
 </script>