NetEq: Fixing a corner case with depleted sync buffer

webrtc/modules/audio_coding/main/acm2/audio_coding_module_unittest_oldapi.cc

Index: webrtc/modules/audio_coding/main/acm2/audio_coding_module_unittest_oldapi.cc
diff --git a/webrtc/modules/audio_coding/main/acm2/audio_coding_module_unittest_oldapi.cc b/webrtc/modules/audio_coding/main/acm2/audio_coding_module_unittest_oldapi.cc
index 4b53a524e9fb406d4815bed64f18a2ca5f5a5e7c..b7289fc7cbe6107de921ef82aa61ef32ab5ada40 100644
--- a/webrtc/modules/audio_coding/main/acm2/audio_coding_module_unittest_oldapi.cc
+++ b/webrtc/modules/audio_coding/main/acm2/audio_coding_module_unittest_oldapi.cc
@@ -1000,6 +1000,9 @@ TEST_F(AcmReceiverBitExactnessOldApi, MAYBE_48kHzOutputExternalDecoder) {
   EXPECT_CALL(mock_decoder, HasDecodePlc())
       .Times(AtLeast(1))
       .WillRepeatedly(Invoke(&decoder, &AudioDecoderPcmU::HasDecodePlc));
+  EXPECT_CALL(mock_decoder, PacketDuration(_, _))
+      .Times(AtLeast(1))
+      .WillRepeatedly(Invoke(&decoder, &AudioDecoderPcmU::PacketDuration));
   ExternalDecoder ed;
   ed.rtp_payload_type = 0;
   ed.external_decoder = &mock_decoder;