Add instrumentation to track the IceEndpointType.

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..b03c0c24e6a2ea5ce4839f6b074da275189ce609 100644
--- a/webrtc/p2p/base/turnport_unittest.cc
+++ b/webrtc/p2p/base/turnport_unittest.cc
@@ -712,6 +712,8 @@ TEST_F(TurnPortTest, TestTurnSendDataTurnUdpToUdp) {
   // Create ports and prepare addresses.
   CreateTurnPort(kTurnUsername, kTurnPassword, kTurnUdpProtoAddr);
   TestTurnSendData();
+  EXPECT_EQ(turn_port_->Candidates()[0].relay_protocol(),
+            cricket::UDP_PROTOCOL_NAME);
 }
 
 // Do a TURN allocation, establish a TCP connection, and send some data.
@@ -720,6 +722,8 @@ TEST_F(TurnPortTest, TestTurnSendDataTurnTcpToUdp) {
   // Create ports and prepare addresses.
   CreateTurnPort(kTurnUsername, kTurnPassword, kTurnTcpProtoAddr);
   TestTurnSendData();
+  EXPECT_EQ(turn_port_->Candidates()[0].relay_protocol(),
+            cricket::TCP_PROTOCOL_NAME);
 }
 
 // Test TURN fails to make a connection from IPv6 address to a server which has