[Webkit-unassigned] [Bug 164905] Make it possible to test non-stable-state scrolling on iOS

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=164905

--- Comment #2 from Simon Fraser (smfr) <simon.fraser at apple.com> ---
The source of the flakiness is that sometimes TileController::adjustTileCoverageRect() has CoverageForVisibleArea and sometimes CoverageForVerticalScrolling. That's affected by FrameView::speculativeTilingEnabled() which is in turn affected by FrameView::wasScrolledByUser(). FrameView:: wasScrolledByUser() is being set via EventHandler::sendScrollEvent() (why?). This is called from FrameView::scrollPositionChanged(), which uses the eventThrottlingDelay() from WebKit2.

There are also timers at various points in this chain. It's all very hard to get stable for testing.

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