Add enumerations for compressed (E)AC3 sample format

media/audio/audio_manager_base.cc

Index: media/audio/audio_manager_base.cc
diff --git a/media/audio/audio_manager_base.cc b/media/audio/audio_manager_base.cc
index 944156c66c6f8e9eb1e561ea1896b01a9c05a083..9cd67d177ddf43e230f5b4001e29f1070b3a4f29 100644
--- a/media/audio/audio_manager_base.cc
+++ b/media/audio/audio_manager_base.cc
@@ -136,6 +136,12 @@ AudioOutputStream* AudioManagerBase::MakeAudioOutputStream(
     case AudioParameters::AUDIO_PCM_LOW_LATENCY:
       stream = MakeLowLatencyOutputStream(params, device_id, log_callback);
       break;
+    case AudioParameters::AUDIO_BITSTREAM_AC3:
+    case AudioParameters::AUDIO_BITSTREAM_EAC3:
+      // TODO(tsunghung): create passthrough output stream.
+      NOTREACHED();
+      stream = nullptr;
+      break;
     case AudioParameters::AUDIO_FAKE:
       stream = FakeAudioOutputStream::MakeFakeStream(this, params);
       break;