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This also required implementing the type tables for int64/uint64 as
BigInt. Additionally, some test support code to pull BigInt out of V8 as
64-bit types because gin assumes always-Number.

Bug: 883496
Change-Id: I10d07124e59f0fdde8f053007eca30508751b211
Reviewed-on: https://chromium-review.googlesource.com/c/1318729
Commit-Queue: Scott Graham <scottmg@chromium.org>
Reviewed-by: Wez <wez@chromium.org>
Cr-Commit-Position: refs/heads/master@{#606261}