TaskScheduler [6] SchedulerWorkerThread

A SchedulerWorkerThread runs Tasks from Sequences returned by a custom
callback.

This change is a subset of https://codereview.chromium.org/1698183005/

BUG=553459

CC_FUTURE=chromium-reviews, vmpstr+watch@chromium.org

Review URL: https://codereview.chromium.org/1704113002

Cr-Commit-Position: refs/heads/master@{#384441}


CrOS-Libchrome-Original-Commit: 93649e8fc3faf88cee5a9b03b67199c4bb614b1c
5 files changed
tree: e1a542cd5f3220f867d4054b9baee58f559e16d8
  1. base/
  2. build/
  3. components/
  4. dbus/
  5. device/
  6. ipc/
  7. mojo/
  8. testing/
  9. third_party/
  10. ui/