GitLab

This CL redefines GPUOrigin3D as not only a GPUOrigin3DDict, but also a
sequence of unsigned long as specified in
https://gpuweb.github.io/gpuweb/#typedefdef-gpuorigin3d

Bug: 877147
Change-Id: Ifa8dfef0891b1018fd497a30b8a9b5d4a05c91a9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1828905
Commit-Queue: François Beaufort <beaufort.francois@gmail.com>
Reviewed-by: Austin Eng <enga@chromium.org>
Reviewed-by: Mike West <mkwst@chromium.org>
Cr-Commit-Position: refs/heads/master@{#701955}