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This change persists the FCP session statistics used by the prediction
manager using a pref so that the first page load of the next session
will have a non-zero value for the first page load of the session.
This should improve the accuracy of the slow page prediction model
in these cases.

Bug: 1036026
Change-Id: I015c4ce5d654af614e947ae2352b4c75d6059067
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1977745Reviewed-by: Sophie Chang <sophiechang@chromium.org>
Reviewed-by: Robert Ogden <robertogden@chromium.org>
Commit-Queue: Michael Crouse <mcrouse@chromium.org>
Cr-Commit-Position: refs/heads/master@{#727173}