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Fixes potential NANs from gfx::AngleBetweenVectorsInDegrees and
gfx::ClockwiseAngleBetweenVectorsInDegrees when the given vectors are
very close together by clamping the value passed to acos. When
unclamped, the value passed to acos could be slightly outside [-1, 1]
due to floating point precision.

Bug: 918734
Change-Id: I55b75b21581d25134fdc3e8e6db80892607a807c
Reviewed-on: https://chromium-review.googlesource.com/c/1394086Reviewed-by: Ian Vollick <vollick@chromium.org>
Commit-Queue: Brian Sheedy <bsheedy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#619780}