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Appending linux as a supproted platform for the update pgo script.
Adding the linux.pgo.txt with the latest profile information.

Bug: 1105530
Change-Id: I63ec40b915970d9ad8a06aaaf594dcbf96dad109
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2347070
Commit-Queue: Jeff Yoon <jeffyoon@chromium.org>
Commit-Queue: Yuke Liao <liaoyuke@chromium.org>
Auto-Submit: Jeff Yoon <jeffyoon@chromium.org>
Reviewed-by: Yuke Liao <liaoyuke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#796521}