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Makes GPU gold pixel tests output links to the triage page for the
entire CL instead of each individual image when running on the trybots.
This makes it so that users only need to open one link regardless of
how many failures there are in order to triage everything.

Bug: 1008524

Change-Id: I94891663fe09bb59ba386e7bd24bc72a4ffe1468
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1825907
Commit-Queue: Brian Sheedy <bsheedy@chromium.org>
Auto-Submit: Brian Sheedy <bsheedy@chromium.org>
Reviewed-by: Yuly Novikov <ynovikov@chromium.org>
Cr-Commit-Position: refs/heads/master@{#700441}