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To avoid having 2 tasks with same queue_time, each PushTask is preceded by
a FastForward().
In previous CL 1778925, I put FastForward at the wrong place. This moves
it to right before PushTask().

Bug: 998477
Change-Id: Ifb87e46d364b3bc3e4d555f11f09ad3a34ce4b19
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1784627Reviewed-by: Gabriel Charette <gab@chromium.org>
Commit-Queue: Etienne Pierre-Doray <etiennep@chromium.org>
Cr-Commit-Position: refs/heads/master@{#693186}