Fix a Turn TCP port issue.

webrtc/p2p/base/turnport_unittest.cc

Index: webrtc/p2p/base/turnport_unittest.cc
diff --git a/webrtc/p2p/base/turnport_unittest.cc b/webrtc/p2p/base/turnport_unittest.cc
index 3172ba252f2930156792fa57049d31c460f5c045..410eb9917d08cabae48d1e76e976325780a85072 100644
--- a/webrtc/p2p/base/turnport_unittest.cc
+++ b/webrtc/p2p/base/turnport_unittest.cc
@@ -490,6 +490,25 @@ TEST_F(TurnPortTest, TestTurnTcpAllocate) {
   EXPECT_NE(0, turn_port_->Candidates()[0].address().port());
 }
 
+// Test that sending a TurnAllocate will fail if the TCP connection is closed.
+TEST_F(TurnPortTest, TestSendingAllocateWhenSocketClosed) {
+  turn_server_.AddInternalSocket(kTurnTcpIntAddr, cricket::PROTO_TCP);
+  CreateTurnPort(kTurnUsername, kTurnPassword, kTurnTcpProtoAddr);
+  EXPECT_EQ(0, turn_port_->SetOption(rtc::Socket::OPT_SNDBUF, 10 * 1024));
+  turn_port_->PrepareAddress();
+  turn_ready_ = false;
+  turn_port_->SendAllocateRequest(0);
+  EXPECT_TRUE_WAIT(turn_ready_, kTimeout);
+
+  // Close the socket and send the request again.
+  turn_ready_ = false;
+  turn_port_->OnSocketClose(turn_port_->socket(), 1);
+  turn_port_->SendAllocateRequest(0);
+  // Wait for half a second and check.
+  WAIT(false, kTimeout / 2);
+  EXPECT_FALSE(turn_ready_);
+}
+
 // Test case for WebRTC issue 3927 where a proxy binds to the local host address
 // instead the address that TurnPort originally bound to. The candidate pair
 // impacted by this behavior should still be used.