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- Reworks code that sets V8 flags for SharedArrayBuffer and Wasm
  Threads to also set the new V8 Atomics flag.
- Atomics are now always enabled.
- SharedArrayBuffer is enabled on desktop, and on Android only with
  site isolation.

Bug: chromium:923807
Change-Id: If40bcbf66216680f0f52ec1bf02dce475b38b1f9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2343566
Commit-Queue: Bill Budge <bbudge@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Reviewed-by: Ben Smith <binji@chromium.org>
Cr-Commit-Position: refs/heads/master@{#811533}