[webkit-reviews] review requested: [Bug 78864] Register fixed position layers with ScrollingCoordinator : [Attachment 146296] Patch

[bugzilla-daemon at webkit.org]

Sami Kyostila <skyostil at google.com> has asked  for review:
Bug 78864: Register fixed position layers with ScrollingCoordinator
https://bugs.webkit.org/show_bug.cgi?id=78864

Attachment 146296: Patch
https://bugs.webkit.org/attachment.cgi?id=146296&action=review

------- Additional Comments from Sami Kyostila <skyostil at google.com>
- Added SC::supportsFixedPositionLayers() for gating fast fixed position
scrolling