[Webkit-unassigned] [Bug 193539] Implement asynchronous frame scrolling for iOS

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=193539

--- Comment #4 from Antti Koivisto <koivisto at iki.fi> ---
(In reply to Frédéric Wang (:fredw) from comment #3)
> Not sure how different this bug is, but FYI I had patches in bug 173833, bug
> 192303, bug 182868 with various tests that were pending review.

Interesting! I wasn't aware of that patch. Looks very similar. The main differences seem to be

- this patch ties to asyncFrameScrollingEnabled internal setting and doesn't enable the feature by default
- eliminates the unnecessary clip layer in async scrolling case (UIScrollView clips).
- uses the same ScrolliongTreeFrameScrollingNode type for both main frame and subframe, switching operation based on the scroll layer type (so the setting also works)
- is missing some of the bug fixes
- doesn't add tests

I propose we land this version as a starting point that can be experimented with and then work towards integrating your tests and bug fixes. How does that sound?

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