MediaStreamTrack: Add echo-cancellation and device-id to getSettings

content/renderer/media/external_media_stream_audio_source.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/renderer/media/external_media_stream_audio_source.h"
 
 namespace content {
 
 ExternalMediaStreamAudioSource::ExternalMediaStreamAudioSource(
     scoped_refptr<media::AudioCapturerSource> source,
@@ skipping 12 matching lines @@
       16,  // Legacy parameter (data is always in 32-bit float format).
       frames_per_buffer));
 }
 
 ExternalMediaStreamAudioSource::~ExternalMediaStreamAudioSource() {
   DVLOG(1)
       << "ExternalMediaStreamAudioSource::~ExternalMediaStreamAudioSource()";
   EnsureSourceIsStopped();
 }
 
+void ExternalMediaStreamAudioSource::getSettings(
+    blink::WebMediaStreamTrack::Settings& settings) {
+  // This source type does not support echo cancellation.
+  settings.setEchoCancellation(false);
+}
+
 bool ExternalMediaStreamAudioSource::EnsureSourceIsStarted() {
   DCHECK(thread_checker_.CalledOnValidThread());
   if (was_started_)
     return true;
   VLOG(1) << "Starting externally-provided "
           << (is_local_source() ? "local" : "remote")
           << " source with audio parameters={"
           << GetAudioParameters().AsHumanReadableString() << "}.";
   source_->Initialize(GetAudioParameters(), this, -1);
   source_->Start();
@@ skipping 26 matching lines @@
       *audio_bus,
       base::TimeTicks::Now() -
           base::TimeDelta::FromMilliseconds(audio_delay_milliseconds));
 }
 
 void ExternalMediaStreamAudioSource::OnCaptureError(const std::string& why) {
   StopSourceOnError(why);
 }
 
 }  // namespace content