Add RtcpMuxPolicy to PeerConnection.

LayoutTests/fast/mediastream/RTCPeerConnection.html

Index: LayoutTests/fast/mediastream/RTCPeerConnection.html
diff --git a/LayoutTests/fast/mediastream/RTCPeerConnection.html b/LayoutTests/fast/mediastream/RTCPeerConnection.html
index 3b40eeaf3ad276df0f7aeb63bb13d155e628f9a1..74e2e4c89dca2fbb2d3bb65476f52a73c370abfc 100644
--- a/LayoutTests/fast/mediastream/RTCPeerConnection.html
+++ b/LayoutTests/fast/mediastream/RTCPeerConnection.html
@@ -39,6 +39,10 @@ shouldNotThrow("new webkitRTCPeerConnection({iceServers:[], bundlePolicy:'max-bu
 shouldNotThrow("new webkitRTCPeerConnection({iceServers:[], bundlePolicy:'max-compat'}, null);");
 shouldThrow("new webkitRTCPeerConnection({iceServers:[], bundlePolicy:'foo'}, null);");
 
+shouldNotThrow("new webkitRTCPeerConnection({iceServers:[], rtcpMuxPolicy:'negotiate'}, null);");
+shouldNotThrow("new webkitRTCPeerConnection({iceServers:[], rtcpMuxPolicy:'require'}, null);");
+shouldThrow("new webkitRTCPeerConnection({iceServers:[], rtcpMuxPolicy:'foo'}, null);");
+
 shouldNotThrow("new webkitRTCPeerConnection(null, {mandatory:{valid_and_supported_1:1}});");
 shouldNotThrow("new webkitRTCPeerConnection(null, {mandatory:{valid_and_supported_1:1, valid_and_supported_2:1}});");
 shouldNotThrow("new webkitRTCPeerConnection(null, {optional:[{valid_and_supported_1:0}]});");