Use simulcast for screenshare only in conference mode

webrtc/media/engine/webrtcvideoengine2_unittest.cc

Index: webrtc/media/engine/webrtcvideoengine2_unittest.cc
diff --git a/webrtc/media/engine/webrtcvideoengine2_unittest.cc b/webrtc/media/engine/webrtcvideoengine2_unittest.cc
index 62e1ea760cd05a64b993f3cea32531cc920c3fcc..f8ed89c97eba4bcfd3053a70b931ee8b4304c38c 100644
--- a/webrtc/media/engine/webrtcvideoengine2_unittest.cc
+++ b/webrtc/media/engine/webrtcvideoengine2_unittest.cc
@@ -4372,4 +4372,12 @@ TEST_F(WebRtcVideoChannel2SimulcastTest, SetSendCodecsForSimulcastScreenshare) {
                           true);
 }
 
+TEST_F(WebRtcVideoChannel2SimulcastTest,
+       NoSimulcastScreenshareWithoutConference) {
+  webrtc::test::ScopedFieldTrials override_field_trials_(
+      "WebRTC-SimulcastScreenshare/Enabled/");
+  VerifySimulcastSettings(cricket::VideoCodec("VP8"), 1280, 720, 3, 1, true,
+                          false);
+}
+
 }  // namespace cricket