Fix the issue of setting local description with datachannel only and max-bundle.

webrtc/api/peerconnection_unittest.cc

Index: webrtc/api/peerconnection_unittest.cc
diff --git a/webrtc/api/peerconnection_unittest.cc b/webrtc/api/peerconnection_unittest.cc
index 981cec778a690108de0b21850e4c3328a035cabe..5d4a14d67373b045bf22771b812e29db663cee12 100644
--- a/webrtc/api/peerconnection_unittest.cc
+++ b/webrtc/api/peerconnection_unittest.cc
@@ -1762,6 +1762,18 @@ TEST_F(P2PTestConductor, LocalP2PTestOfferDtlsButNotSdes) {
   VerifyRenderedSize(640, 480);
 }
 
+// This test verifies that the negotiation will success with data channel only

[Taylor Brandstetter, 2016/11/02 23:10:22]

"will success" -> "will succeed"

+// in max-bundle mode.
+TEST_F(P2PTestConductor, LocalP2PTestOfferDataChannelOnly) {
+  webrtc::PeerConnectionInterface::RTCConfiguration rtc_config;
+  rtc_config.bundle_policy =
+      webrtc::PeerConnectionInterface::kBundlePolicyMaxBundle;
+  ASSERT_TRUE(CreateTestClients(rtc_config, rtc_config));
+  initializing_client()->CreateDataChannel();
+  initializing_client()->AddMediaStream(false /*No audio*/, false /*No video*/);

[Taylor Brandstetter, 2016/11/02 23:10:22]

Just curious, why is adding a media stream necessary? Is it due to the weird
test infrastructure? May be worth leaving a comment explaining.

+  initializing_client()->Negotiate();
+}
+
 // This test sets up a Jsep call between two parties, and the callee only
 // accept to receive video.
 TEST_F(P2PTestConductor, LocalP2PTestAnswerVideo) {