Support (E)AC3 passthrough

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..f2771081bc3a3520c05d104bce528d7c2428ea30 100644
--- a/media/audio/audio_manager_base.cc
+++ b/media/audio/audio_manager_base.cc
@@ -136,6 +136,10 @@ AudioOutputStream* AudioManagerBase::MakeAudioOutputStream(
     case AudioParameters::AUDIO_PCM_LOW_LATENCY:
       stream = MakeLowLatencyOutputStream(params, device_id, log_callback);
       break;
+    case AudioParameters::AUDIO_RAW_AC3:
+    case AudioParameters::AUDIO_RAW_EAC3:
+      stream = MakeRawOutputStream(params, device_id, log_callback);
+      break;
     case AudioParameters::AUDIO_FAKE:
       stream = FakeAudioOutputStream::MakeFakeStream(this, params);
       break;
@@ -151,6 +155,13 @@ AudioOutputStream* AudioManagerBase::MakeAudioOutputStream(
   return stream;
 }
 
+AudioOutputStream* AudioManagerBase::MakeRawOutputStream(
+    const AudioParameters& params,
+    const std::string& device_id,
+    const LogCallback& log_callback) {
+  return nullptr;
+}
+
 AudioInputStream* AudioManagerBase::MakeAudioInputStream(
     const AudioParameters& params,
     const std::string& device_id,
@@ -254,7 +265,8 @@ AudioOutputStream* AudioManagerBase::MakeAudioOutputStreamProxy(
   const base::TimeDelta kCloseDelay =
       base::TimeDelta::FromSeconds(kStreamCloseDelaySeconds);
   scoped_refptr<AudioOutputDispatcher> dispatcher;
-  if (output_params.format() != AudioParameters::AUDIO_FAKE) {
+  if (output_params.format() != AudioParameters::AUDIO_FAKE &&
+      !output_params.IsRawFormat()) {
     dispatcher = new AudioOutputResampler(this, params, output_params,
                                           output_device_id,
                                           kCloseDelay);