[webkit-reviews] review requested: [Bug 70103] [chromium] Implement position:fixed in compositor thread : [Attachment 146216] Polished and buffed, and with unit tests

[bugzilla-daemon at webkit.org]

Shawn Singh <shawnsingh at chromium.org> has asked  for review:
Bug 70103: [chromium] Implement position:fixed in compositor thread
https://bugs.webkit.org/show_bug.cgi?id=70103

Attachment 146216: Polished and buffed, and with unit tests
https://bugs.webkit.org/attachment.cgi?id=146216&action=review

------- Additional Comments from Shawn Singh <shawnsingh at chromium.org>
This patch is now pretty clean and robust, including unit tests. Please note
that I removed the ScrollingCoordinator code from this patch; if you want, this
patch could even land before 78864 (the included unit tests will cover the code
in this patch even without 78864).