Bug 1574407 [wpt PR 18491] - Create new list for paced animation valu…

…es, a=testonly

Automatic update from web-platform-tests
Create new list for paced animation values

SVGAnimationElement::calculateKeyTimesForCalcModePaced() used to
overwrite the data passed in by the user. This commit fixes the
issue and there are now two lists stored, one with the user data
and one with the key times for paced.

This is a bug fix and should only affect SVGAnimationElements,
there will be an increase in memory usage, especially for animation
intensive scenes. Can be avoided by changing to a CPU heavy approach,
but this will probably be more energy efficient for mobile devices.

Bug: 231525
Change-Id: Ief9bbb8c6d1133d0041ad2c8f5a3d63f9ddcde90
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1757825
Reviewed-by: Fredrik Söderquist <fsopera.com>
Commit-Queue: Edvard Thörnros <edvardtopera.com>
Cr-Commit-Position: refs/heads/master{#687651}

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wpt-commits: 6ee27431c3352f158b198de70c0816bf1b485a05
wpt-pr: 18491

UltraBlame original commit: d98394ad1bbd224bd20ca9aef35d7fb1e5563097