NetEq: Fixing a corner case with depleted sync buffer

webrtc/modules/audio_coding/neteq/mock/mock_audio_decoder.h

Index: webrtc/modules/audio_coding/neteq/mock/mock_audio_decoder.h
diff --git a/webrtc/modules/audio_coding/neteq/mock/mock_audio_decoder.h b/webrtc/modules/audio_coding/neteq/mock/mock_audio_decoder.h
index 90f132b0f7fc5524f2555861e4e25dd4f5a8eab7..8debcbbb1e271fb018b59a46e5e6372c50d0f9a7 100644
--- a/webrtc/modules/audio_coding/neteq/mock/mock_audio_decoder.h
+++ b/webrtc/modules/audio_coding/neteq/mock/mock_audio_decoder.h
@@ -31,6 +31,7 @@ class MockAudioDecoder : public AudioDecoder {
   MOCK_METHOD5(IncomingPacket, int(const uint8_t*, size_t, uint16_t, uint32_t,
                                    uint32_t));
   MOCK_METHOD0(ErrorCode, int());
+  MOCK_CONST_METHOD2(PacketDuration, int(const uint8_t*, size_t));
   MOCK_CONST_METHOD0(Channels, size_t());
   MOCK_CONST_METHOD0(codec_type, NetEqDecoder());
   MOCK_METHOD1(CodecSupported, bool(NetEqDecoder));