Add hasViewportRule() flag to StyleSheetContents.
This is a pre-requisite for collecting viewport rules before generating
the RuleSet. The RuleSet contents depends on media query evaluation,
which in turn depends on viewport size resolution, which means we are
currently may generate the RuleSet, and recalculate style, twice in the
presence of both @media and @viewport.
This CL is split out from [1] which in turn is split out from [2].
[1] https://codereview.chromium.org/2405143003/
[2] https://codereview.chromium.org/1913833002/
R=timloh@chromium.org
BUG=463098
Review-Url: https://codereview.chromium.org/2408353003
Cr-Commit-Position: refs/heads/master@{#425273}
5 files changed
