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'states' is represented by blink::CustomStatesTokenList inherited from
DOMTokenList. It passes a null QualifiedName to DOMTokenList as the
associated attribute name. CustomStatesTokenList doesn't keep a
serialized string, and 'value' getter serializes tokens on the fly.

This CL doesn't contains changes for ':state()' pseudo class.

The 'states' IDL attribute is behind a new runtime flag,
CustomStatePseudoClass.

Bug: 1012098
Change-Id: Icee5f1703f5930603117c1ba73994f3bbba4e2cd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1847606Reviewed-by: Rakina Zata Amni <rakina@chromium.org>
Commit-Queue: Kent Tamura <tkent@chromium.org>
Cr-Commit-Position: refs/heads/master@{#704118}