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Currently, if physics based fling curve is enabled, even if the fling is
boosted, the scroll distance is capped by upper bound which is three
times the size of viewport. Thus it nullify the effect of fling boosting
and travels the same distance as it would if fling is not boosted.

This CL fixes fling boosting with physics based fling curve. It does
so by increasing the upper bound every time a fling is boosted.

Bug: 647137
Change-Id: Ib2dd51b37df91168ae1f1e8d33888e3b5dc43e23
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2118218Reviewed-by: Navid Zolghadr <nzolghadr@chromium.org>
Reviewed-by: David Bokan <bokan@chromium.org>
Reviewed-by: Daniel Libby <dlibby@microsoft.com>
Commit-Queue: Sahir Vellani <sahir.vellani@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#758878}