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This CL redefines GPUExtent3D as not only a GPUExtent3DDict, but also a
sequence of unsigned long as specified in
https://gpuweb.github.io/gpuweb/#typedefdef-gpuextent3d

Bug: 877147
Change-Id: If5eb7d3b6f79f1234938f1fbae7c7fe5f0b7aa28
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1828909
Commit-Queue: François Beaufort <beaufort.francois@gmail.com>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Reviewed-by: Mike West <mkwst@chromium.org>
Cr-Commit-Position: refs/heads/master@{#701522}