GitLab

This CL is turning on the CPU sampler category.
  see: https://chromium-review.googlesource.com/c/chromium/src/+/1191745/

It's also turning on the task scheduler info. Which is adding the
task_priority to the trace and will ease finding priority inversion.

  Title          TaskTracker::RunTask
  Category       task_scheduler
  Args
    task_info    {execution_mode: "parallel", task_priority: "USER_BLOCKING"}


R=etiennep@chromium.org, oysteine@chromium.org

Bug: 867931
Change-Id: I8f6e4772816cc446a25c04ce0cda4b9d45c44232
Reviewed-on: https://chromium-review.googlesource.com/1199567
Commit-Queue: Etienne Bergeron <etienneb@chromium.org>
Reviewed-by: oysteine <oysteine@chromium.org>
Cr-Commit-Position: refs/heads/master@{#588179}