Add base::TaskTraits::Override().

Returns TaskTraits constructed by combining two TaskTraits. If a trait
is in both TaskTraits, the returned TaskTraits will have the value from
the second TaskTraits.

BUG=713683
R=gab@chromium.org,robliao@chromium.org

Review-Url: https://codereview.chromium.org/2873453002
Cr-Commit-Position: refs/heads/master@{#470377}


CrOS-Libchrome-Original-Commit: 6ef24a2589286dd4939a20dc1afddf4ecd9212a0
4 files changed
tree: 739d5b0163979e8568b3259b297cc4c8b32eeee8
  1. base/
  2. build/
  3. components/
  4. dbus/
  5. device/
  6. ipc/
  7. mojo/
  8. testing/
  9. third_party/
  10. ui/