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This CL adds LSQ predictor to input prediction.
LSQ predictor uses a quadratic least square regression model:
y = b0 + b1 * x + b2 * x ^ 2.

The resampling is still behind flag: kResampleInputEvents.

design doc:
https://docs.google.com/document/d/1DLfibi2NkV85p7AfEtNkvy24d283VRBSd3hz1Qh24Jw/edit#

Bug: 836352
Change-Id: Ie1959c6b95152a80076debfb762c49d88a758af3
Reviewed-on: https://chromium-review.googlesource.com/1003220
Commit-Queue: Ella Ge <eirage@chromium.org>
Reviewed-by: Dave Tapuska <dtapuska@chromium.org>
Reviewed-by: danakj <danakj@chromium.org>
Reviewed-by: Navid Zolghadr <nzolghadr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#565035}