Do not report bucket delay when pacer is paused.

webrtc/modules/congestion_controller/congestion_controller_unittest.cc

Index: webrtc/modules/congestion_controller/congestion_controller_unittest.cc
diff --git a/webrtc/modules/congestion_controller/congestion_controller_unittest.cc b/webrtc/modules/congestion_controller/congestion_controller_unittest.cc
index ce2258bf5e0a37ad5d2850d4039e063ea0482c2e..53ccf3dda1d21c1c8f16be14522348181b4bf9b0 100644
--- a/webrtc/modules/congestion_controller/congestion_controller_unittest.cc
+++ b/webrtc/modules/congestion_controller/congestion_controller_unittest.cc
@@ -18,6 +18,7 @@
 #include "webrtc/system_wrappers/include/clock.h"
 
 using testing::_;
+using testing::AtLeast;
 using testing::NiceMock;
 using testing::Return;
 using testing::SaveArg;
@@ -169,5 +170,21 @@ TEST_F(CongestionControllerTest,
   controller_->Process();
 }
 
+TEST_F(CongestionControllerTest, GetPacerQueuingDelayMs) {
+  EXPECT_CALL(observer_, OnNetworkChanged(_, _, _)).Times(AtLeast(1));
+
+  const int64_t kQueueTimeMs = 123;
+  EXPECT_CALL(*pacer_, QueueInMs()).WillRepeatedly(Return(kQueueTimeMs));
+  EXPECT_EQ(kQueueTimeMs, controller_->GetPacerQueuingDelayMs());
+
+  // Expect zero pacer delay when network is down.
+  controller_->SignalNetworkState(kNetworkDown);
+  EXPECT_EQ(0, controller_->GetPacerQueuingDelayMs());
+
+  // Network is up, pacer delay should be reported.
+  controller_->SignalNetworkState(kNetworkUp);
+  EXPECT_EQ(kQueueTimeMs, controller_->GetPacerQueuingDelayMs());
+}
+
 }  // namespace test
 }  // namespace webrtc