Expose RTCPeerConnection.icegatheringstatechange.

chrome/browser/media/webrtc/webrtc_browsertest.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/command_line.h"
 #include "build/build_config.h"
 #include "chrome/browser/media/webrtc/webrtc_browsertest_base.h"
 #include "chrome/browser/media/webrtc/webrtc_browsertest_common.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/browser_tabstrip.h"
@@ skipping 212 matching lines @@
   }
   for (const std::string& type : VerifyStatsGeneratedPromise(left_tab_)) {
     missing_expected_stats.erase(type);
   }
   for (const std::string& type : missing_expected_stats) {
     EXPECT_TRUE(false) << "Expected stats dictionary is missing: " << type;
   }
 
   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();
+}