Use a singleton CSSParserContext in SVGLength::SetValueAsString
Creating this object for each call represents a significant part of the entire function. Using a singleton instead reduces the runtime of the testcase "usingSetAttribute" from the referenced bug's comment #5 by around 20% locally. Bug: 978513 Change-Id: I5d3447baf04706e2c23da4ed07cb0197d0349ac7 Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1681766Reviewed-by:Stephen Chenney <schenney@chromium.org> Commit-Queue: Fredrik Söderquist <fs@opera.com> Cr-Commit-Position: refs/heads/master@{#673325}
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