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This CL is a preparation step to Onion soup webrtc_audio_renderer.cc|h.
It adds to blink::Platform two methods that expose the AudioDeviceFactory
functionality needed by WebRtcAudioRenderer.

It is part of the phase 3.3.10 in the design doc [1]

[1] https://docs.google.com/document/d/1rHJGi1U72qZsOGIctIf7GKRaY8d7BgtVW8MaMYumzYY/

BUG=704136
R=guidou@chromium.org, haraken@chromium.org

Change-Id: If9e4c03f583fee43bfe5cb182f852c16266c6acb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1678297
Commit-Queue: Kentaro Hara <haraken@chromium.org>
Auto-Submit: Antonio Gomes <tonikitoo@igalia.com>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Reviewed-by: Guido Urdaneta <guidou@chromium.org>
Cr-Commit-Position: refs/heads/master@{#672739}