[Webkit-unassigned] [Bug 194289] [iOS] Support fixed positioning with async scrolling

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=194289

--- Comment #2 from Antti Koivisto <koivisto at iki.fi> ---
The existing code computes fixed position rect based on the last layout scroll position in web process and then tries to make it match the actual layer position by applying offsets in the UI process.

This patch gets rid of all that and simply computes the correct fixed position rect entirely in the UI (scrolling tree) side.

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