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In scroll prediction, we set the resampled event time to the
prediction_time (frame time or the timestamp we try to predict to).
However some predictor (linear resampling) may change the sample time.
LinearResampling changes it to frame_time - 5ms.

This causes the prediction metrics (introduced in crrev.com/c/1764409)
comparing the predicted result with wrong interpolated point.

This CL makes the predictors' return value (InputData type) also applies
the actual predict time.

Change-Id: Ib84db552f7e41976b9418e57056d9948781c2c92
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1848111Reviewed-by: Ella Ge <eirage@chromium.org>
Reviewed-by: Navid Zolghadr <nzolghadr@chromium.org>
Commit-Queue: Ella Ge <eirage@chromium.org>
Cr-Commit-Position: refs/heads/master@{#707964}