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Deflake VR fling scrolling test on older devices

Adds in retries to the VR fling scrolling test to help combat flakiness
on older/slower devices. The previous version of the test was stable on
newer devices such as the Pixel 2, but was flaking on the Pixel XLs used
by the bots due to scroll jank.

Bug: 923093
Change-Id: I218b09c4ae827149541eda0c735a8121b16dd970
Reviewed-on: https://chromium-review.googlesource.com/c/1448530Reviewed-by: Bill Orr <billorr@chromium.org>
Commit-Queue: Brian Sheedy <bsheedy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#628509}