NetEq: Fix stats counting in muted mode

webrtc/modules/audio_coding/neteq/neteq_unittest.cc

Index: webrtc/modules/audio_coding/neteq/neteq_unittest.cc
diff --git a/webrtc/modules/audio_coding/neteq/neteq_unittest.cc b/webrtc/modules/audio_coding/neteq/neteq_unittest.cc
index 4a6f505fc639c4edb0b515f712a471ec0c9237cc..cf8e5b474c282f55cf18da70b6536a6ef402214b 100644
--- a/webrtc/modules/audio_coding/neteq/neteq_unittest.cc
+++ b/webrtc/modules/audio_coding/neteq/neteq_unittest.cc
@@ -1608,6 +1608,15 @@ TEST_F(NetEqDecodingTestWithMutedState, MutedState) {
   // packet. Verify that normal operation resumes.
   InsertPacket(kSamples * counter_);
   GetAudioUntilNormal();
+
+  NetEqNetworkStatistics stats;
+  EXPECT_EQ(0, neteq_->NetworkStatistics(&stats));
+  // NetEqNetworkStatistics::expand_rate tells the fraction of samples that were
+  // concealment samples, in Q14 (16384 = 100%) .The vast majority should be
+  // concealment samples in this test.
+  EXPECT_GT(stats.expand_rate, 14000);
+  // And, it should be greater than the speech_expand_rate.
+  EXPECT_GT(stats.expand_rate, stats.speech_expand_rate);
 }
 
 // Verifies that NetEq goes out of muted state when given a delayed packet.