Expose RTCPeerConnection.icegatheringstatechange.

chrome/browser/media/webrtc/webrtc_browsertest.cc

Index: chrome/browser/media/webrtc/webrtc_browsertest.cc
diff --git a/chrome/browser/media/webrtc/webrtc_browsertest.cc b/chrome/browser/media/webrtc/webrtc_browsertest.cc
index 86565b81e7862cc4cd200b3142c91e37bd3318e5..3fd43a7bcbeb8af1a53f39904b000797ce013701 100644
--- a/chrome/browser/media/webrtc/webrtc_browsertest.cc
+++ b/chrome/browser/media/webrtc/webrtc_browsertest.cc
@@ -230,3 +230,18 @@ IN_PROC_BROWSER_TEST_F(WebRtcBrowserTest,
 
   DetectVideoAndHangUp();
 }
+
+IN_PROC_BROWSER_TEST_F(
+    WebRtcBrowserTest,
+    RunsAudioVideoWebRTCCallInTwoTabsEmitsGatheringStateChange) {
+  StartServerAndOpenTabs();
+  SetupPeerconnectionWithLocalStream(left_tab_);
+  SetupPeerconnectionWithLocalStream(right_tab_);
+  NegotiateCall(left_tab_, right_tab_);
+
+  std::string ice_gatheringstate =
+      ExecuteJavascript("getLastGatheringState()", left_tab_);
+
+  EXPECT_EQ("complete", ice_gatheringstate);
+  DetectVideoAndHangUp();
+}