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This change creates an Origin Trial for the Shape Detection API.

Intent to Experiment:
https://groups.google.com/a/chromium.org/d/msg/blink-dev/eJnB-5Sg-mQ/uvdWnO2OBQAJ

Bug: 646035
Change-Id: Ib7b18f8544c0f9d7d4bb8730102800d63cc54c9f
Reviewed-on: https://chromium-review.googlesource.com/1159684Reviewed-by: Chris Harrelson <chrishtr@chromium.org>
Commit-Queue: Reilly Grant <reillyg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#580259}