Add flakiness check if there is no received packets in a certain period.

webrtc/p2p/base/transport_unittest.cc

Index: webrtc/p2p/base/transport_unittest.cc
diff --git a/webrtc/p2p/base/transport_unittest.cc b/webrtc/p2p/base/transport_unittest.cc
index ba11678ece35e0d4704808cf640823c2434b65ce..7b8df64eabb57883e78e283381f0bd8867f30b73 100644
--- a/webrtc/p2p/base/transport_unittest.cc
+++ b/webrtc/p2p/base/transport_unittest.cc
@@ -321,3 +321,24 @@ TEST_F(TransportTest, TestGetStats) {
   ASSERT_EQ(1U, stats.channel_stats.size());
   EXPECT_EQ(1, stats.channel_stats[0].component);
 }
+
+TEST_F(TransportTest, TestReceivingStateChange) {
+  ASSERT_TRUE(SetupChannel());
+  channel_->SetConnectionCount(1);
+  transport_->ConnectChannels();
+  EXPECT_FALSE(transport_->any_channel_receiving());
+
+  channel_->SetReceiving(true);
+  EXPECT_TRUE_WAIT(transport_->any_channel_receiving(), 100);
+  FakeTransportChannel* channel2 = CreateChannel(2);
+  channel2->SetReceiving(true);
+  EXPECT_TRUE_WAIT(transport_->any_channel_receiving(), 100);
+
+  channel2->SetReceiving(false);
+  EXPECT_TRUE_WAIT(transport_->any_channel_receiving(), 100);
+
+  // After both channels become not receiving, the transport receiving state
+  // becomes TRANSPORT_STATE_NONE.
+  channel_->SetReceiving(false);
+  EXPECT_TRUE_WAIT(!transport_->any_channel_receiving(), 100);
+}