#Audio service Provides core audio functionality: audio device access and enumeration. Runs * In a separate process on Windows, Mac (sandboxed) and Linux (unsandboxed); * In the browser process on other platforms. Can be accessed from trusted processes only (the browser process and certains utility processes). Use audio::CreateInputDevice() for the mic capture, and audio::OutputDevice for the playback. Untrusted processes should use media::AudioInputDevice and media::AudioOutputDevice correspondingly, which will take care of device authorization. [Design doc](https://docs.google.com/document/d/1s_Fd1WRDdpb5n6C2MSJjeC3fis6hULZwfKMeDd4K5tI/edit?usp=sharing)