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PredictionMetricsHandler appears to be designed to work for anything
that is predicting points. However, it currently only reports metrics
in the Event.InputEventPrediction.Scroll* histograms. De-couple the
class from these histograms so it can be used for things only than
scroll metrics.

Bug: 1133785
Change-Id: Ib34129fc46b20b45810cbd5ca195483e88c513e2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2441197Reviewed-by: Dave Tapuska <dtapuska@chromium.org>
Reviewed-by: Sadrul Chowdhury <sadrul@chromium.org>
Commit-Queue: Mario Bianucci <mabian@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#813813}