GitLab

Callback called every time the audio buffer needs to be filled:
* https://cs.chromium.org/chromium/src/media/base/audio_pull_fifo.h?rcl=177e90911c8bcb0c547c7974acdf4b249fa67062&l=28

Called as part of a while loop:
* https://cs.chromium.org/chromium/src/media/base/audio_pull_fifo.cc?rcl=177e90911c8bcb0c547c7974acdf4b249fa67062&l=37

This is part of the base::Callback migration.

Context: https://cs.chromium.org/chromium/src/docs/callback.md?rcl=9fcc3764aea8f97e9f6de4a9ee61d554e67edcda&l=40

Bug: 714018
Change-Id: I98bd69edcd0a3162e1a730d64319f0a85ee61bd0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2047027
Commit-Queue: Jose Lopes <jabolopes@google.com>
Auto-Submit: Jose Lopes <jabolopes@google.com>
Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#743498}