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This CL adds PushableMediaStreamAudioSource, which mirrors the video
equivalent PushableMediaStreamVideoSource. This class allows one to
easily push audio data into a MediaStreamTrack.

Bug: 1157608
Change-Id: I6fe3adc26f257eb6f9a6e7d8ff8dad8929ab2a38
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2625829Reviewed-by: Guido Urdaneta <guidou@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Auto-Submit: Thomas Guilbert <tguilbert@chromium.org>
Commit-Queue: Guido Urdaneta <guidou@chromium.org>
Cr-Commit-Position: refs/heads/master@{#844758}