[Webkit-unassigned] [Bug 125398] New: Don't recalc all styles when adding @keyframes, @import and @page

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=125398

           Summary: Don't recalc all styles when adding @keyframes,
                    @import and @page
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Keywords: BlinkMergeCandidate
          Severity: Normal
          Priority: P2
         Component: CSS
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: rniwa at webkit.org
                CC: koivisto at iki.fi, simon.fraser at apple.com,
                    barraclough at apple.com, benjamin at webkit.org,
                    akling at apple.com, psolanki at apple.com


Consider merging https://chromium.googlesource.com/chromium/blink/+/bd8fbc63697a3ac187ee70e7a39ae1c5e039062c

This applies to @import and @page rules as well.
There are probably other rule types which we could
be smarter about, but @keyframes is most common.

I wish I had a good way to test this.  I considered
writing an inspector-timeline test, or adding a
"style recalc count" to settings.internals.  I think
long-term we should consider exposing recalc information
as part of window.performance?  But for now there
doesn't seem to be a nice way to test this change.

Elliott and I discovered when writing/reviewing this
that adding @keyframes after an animation is first
created has no effect in WebKit/Blink.  It should!
I've filed: http://crbug.com/307760

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