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This simplifies invalidation of attribute changes affecting attr()
content from always invalidating for attributes used in attr() on all
elements, to always invalidating with kLocalStyleChange for attr changes
on elements which have ::before/::after content generated from attr().

This means we don't need to block lazy parsing for ::before/::after and
we will respond correctly to attr() used indirectly via var().

Bug: 791525
Change-Id: I13878a56ecf11eb3bd9da356128ac0f32dd5b62d
Reviewed-on: https://chromium-review.googlesource.com/c/1288274
Commit-Queue: Rune Lillesveen <futhark@chromium.org>
Reviewed-by: Anders Ruud <andruud@chromium.org>
Cr-Commit-Position: refs/heads/master@{#600796}