Add PeerConnection IsClosed check.

webrtc/api/peerconnectioninterface_unittest.cc

Index: webrtc/api/peerconnectioninterface_unittest.cc
diff --git a/webrtc/api/peerconnectioninterface_unittest.cc b/webrtc/api/peerconnectioninterface_unittest.cc
index 2594b6c10637996c3a554757a188da633d5b12cb..27db22cd12d6502b9b75ce93de48b218bb419f26 100644
--- a/webrtc/api/peerconnectioninterface_unittest.cc
+++ b/webrtc/api/peerconnectioninterface_unittest.cc
@@ -702,7 +702,9 @@ class PeerConnectionInterfaceTest : public testing::Test {
     } else {
       pc_->SetRemoteDescription(observer, desc);
     }
-    EXPECT_EQ_WAIT(true, observer->called(), kTimeout);
+    if (pc_->signaling_state() != PeerConnectionInterface::kClosed) {
+      EXPECT_EQ_WAIT(true, observer->called(), kTimeout);
+    }

[pthatcher1, 2016/05/12 05:44:13]

Shouldn't we add some unit tests to verify the behavior of the various methods
when a PC is closed?

     return observer->result();
   }