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These would be used for Chromium on top of SwANGLE testing, like WebGL.
Linux64, Mac64, Win32

Not running any tests at this point, to be added in a follow up CL.

Also renames the GCE pools used for non-Chromium SwANGLE trybots.

Bug: 1064477
Change-Id: I11172672a1b41bc567c84778554ecd3eaf353190
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2135132Reviewed-by: Kenneth Russell <kbr@chromium.org>
Commit-Queue: Yuly Novikov <ynovikov@chromium.org>
Cr-Commit-Position: refs/heads/master@{#756103}