Add --disable-background-tasks flag.

This flag delays execution of base::TaskPriority::BACKGROUND tasks
until shutdown.

Bug: 726937
Change-Id: I2ce529a410382e7199558a0ed95476767b14786b
Reviewed-on: https://chromium-review.googlesource.com/919866
Commit-Queue: François Doray <fdoray@chromium.org>
Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Reviewed-by: Tommy Martino <tmartino@chromium.org>
Reviewed-by: Robert Liao <robliao@chromium.org>
Reviewed-by: Gabriel Charette <gab@chromium.org>
Cr-Commit-Position: refs/heads/master@{#537862}

CrOS-Libchrome-Original-Commit: 7b4401f0ecb3645eb61c7e9f7a2b4348bfb036a2
6 files changed
tree: 4281fbb9909fb5f8be0a9cfa7c7174c469de9b96
  1. base/
  2. build/
  3. components/
  4. dbus/
  5. device/
  6. ipc/
  7. mojo/
  8. testing/
  9. third_party/
  10. ui/