user activity: Dremel query to extract the top CWP hot functions.

BUG=None
TEST=None

Change-Id: Iefa803394329f24e850e53e7db692bc004dafb51
Reviewed-on: https://chrome-internal-review.googlesource.com/282195


Tested-by: Evelina Dumitrescu <evelinad@google.com>
Reviewed-by: George Burgess <gbiv@google.com>
Reviewed-by: Ting-Yuan Huang <laszio@google.com>
Commit-Queue: Evelina Dumitrescu <evelinad@google.com>
Reviewed-on: https://chromium-review.googlesource.com/435457


Commit-Ready: Luis Lozano <llozano@chromium.org>
Tested-by: Luis Lozano <llozano@chromium.org>
Reviewed-by: Luis Lozano <llozano@chromium.org>