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This CL adds input event predictor in main thread event queue
under a flag kResampleInputEvents.
It is the basic structure for resample events, without only an
empty predictor. The input predictor handled events before the
event is dispatched. And apply current time to the event.

design doc:
https://docs.google.com/document/d/1DLfibi2NkV85p7AfEtNkvy24d283VRBSd3hz1Qh24Jw/edit?usp=sharing

Bug: 836352
Change-Id: I7c17a33b2e0e5e9a51920e54a9b8ce795537f4ef
Reviewed-on: https://chromium-review.googlesource.com/860429Reviewed-by: Dave Tapuska <dtapuska@chromium.org>
Reviewed-by: Alex Moshchuk <alexmos@chromium.org>
Reviewed-by: Navid Zolghadr <nzolghadr@chromium.org>
Commit-Queue: Ella Ge <eirage@chromium.org>
Cr-Commit-Position: refs/heads/master@{#553744}