There are too many issues with having this API be synchronous; from timeouts to render thread blocks. It makes more sense for it to take a callback and return the info once it's available. If we switched this API to be async we can remove the timeouts entirely or have them be informational only.

The clients which would be hard to convert are:

Cast Mojo Media Client:
https://cs.chromium.org/chromium/src/chromecast/media/service/cast_mojo_media_client.cc?q=GetOutputDeviceInfo&sq=package:chromium&l=77&dr=C

Track audio renderer:
https://cs.chromium.org/chromium/src/content/renderer/media/track_audio_renderer.cc?q=GetOutputDeviceInfo&sq=package:chromium&l=304&dr=C

WebRTC audio rendering:
https://cs.chromium.org/chromium/src/content/renderer/media/webrtc_audio_renderer.cc?q=GetOutputDeviceInfo&sq=package:chromium&l=200&dr=C
https://cs.chromium.org/chromium/src/content/renderer/media/webrtc_local_audio_source_provider.cc?q=GetOutputDeviceInfo&sq=package:chromium&dr=C

AudioRendererMixerManager::GetMixer()
https://cs.chromium.org/chromium/src/content/renderer/media/audio_renderer_mixer_manager.cc?q=GetOutputDeviceInfo&sq=package:chromium&l=193&dr=C

GetAudioHardwareParams:
https://cs.chromium.org/chromium/src/content/renderer/renderer_blink_platform_impl.cc?q=GetOutputDeviceInfo&sq=package:chromium&l=184&dr=C

Pepper Plugin instance:
https://cs.chromium.org/chromium/src/content/renderer/pepper/pepper_plugin_instance_impl.cc?q=GetOutputDeviceInfo&sq=package:chromium&dr=C


The steps to conversion would be:
- Introduce new async api, convert simple clients.
- Convert harder clients.
- Remove older API.