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This CL adds a vector predicted_events_ to WebCoalescedInputEvent, to
support pointer event  getPredictedEvent API.
This CL also changes the InputEventPrediction class used for resampling
to also generate 3 predicted event even when resampling is disabled. The
3 predicted event will be generated by Kalman filter predictor for now,
but in the following CL (add accuracy metrics), we change it to be controll
by another flag, so we can gather accuracy data for different prediction
algorithms on finch without turning on resampling.


Intent to implement:
https://groups.google.com/a/chromium.org/forum/#!topic/blink-dev/CgFyxYikn6A

Bug: 885299
Change-Id: I89b50ceea2847ea501b04ceb0da58f03741c379d
Reviewed-on: https://chromium-review.googlesource.com/c/1232884Reviewed-by: Dave Tapuska <dtapuska@chromium.org>
Reviewed-by: Rick Byers <rbyers@chromium.org>
Reviewed-by: Navid Zolghadr <nzolghadr@chromium.org>
Commit-Queue: Ella Ge <eirage@chromium.org>
Cr-Commit-Position: refs/heads/master@{#600178}