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Add Internals>GPU>Metrics component for rendering.desktop
and rendering.mobile benchmarks.

Also, update the scripts to point to the correct script.

BUG=none

Cq-Include-Trybots: master.tryserver.chromium.perf:obbs_fyi
Change-Id: Ib1e1899d21d14033518ccad09166a131fd4a1f3a
Reviewed-on: https://chromium-review.googlesource.com/1232515
Commit-Queue: Annie Sullivan <sullivan@chromium.org>
Reviewed-by: Annie Sullivan <sullivan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#592375}