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A media task runner can receive tasks whose scheduling
depends on a media timestamp.
The balanced media task runner factory generates some media task
runners whose task schedulings are loosely synchronized between
each other. A direct application is to query audio and video frames
in a balanced way, which minimizes the memory used for muxed streams.

BUG=408189

Review URL: https://codereview.chromium.org/534893002

Cr-Commit-Position: refs/heads/master@{#293368}