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Moves the shared Skia Gold python code from //testing/ to //build/.

The //testing/ location is causing issues for V8, as they include
//build/ but not //testing/.

Bug: 1098641
Change-Id: I9a0b6d5f8d0134f5c1f0caef765e9ecde9ad7360
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2264607
Commit-Queue: John Chen <johnchen@chromium.org>
Reviewed-by: Andrew Grieve <agrieve@chromium.org>
Reviewed-by: John Chen <johnchen@chromium.org>
Auto-Submit: Brian Sheedy <bsheedy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#782250}