webxr-tests: add helper script to update tests in cloud bucket

This creates a new destination directory based on the Cr-Commit-Position
of the top local commit, and updates the index.html file to cover all
found commit positions.

Run with "-h" to see command line options.

Bug: 923149
Change-Id: I6bbef88f6472ae78ee67f153d62acd0874ed1297
Reviewed-on: https://chromium-review.googlesource.com/c/1459928
Commit-Queue: Klaus Weidner <klausw@chromium.org>
Reviewed-by: Brian Sheedy <bsheedy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#630468}
2 files changed