[Webkit-unassigned] [Bug 206884] New: Implement RenderLayer::requestScrollPositionUpdate

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=206884

            Bug ID: 206884
           Summary: Implement RenderLayer::requestScrollPositionUpdate
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Scrolling
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: cathiechen at igalia.com

Implement RenderLayer::requestScrollPositionUpdate so that we can call requestScrollPositionUpdate more convinient.
There's a recursive code path, if we implement it directly.

AsyncScrollingCoordinator::requestScrollPositionUpdate
AsyncScrollingCoordinator::updateScrollPositionAfterAsyncScroll
ScrollableArea::scrollToOffsetWithoutAnimation
ScrollAnimator::scrollToOffsetWithoutAnimation
ScrollAnimator::notifyPositionChanged
ScrollableArea::setScrollOffsetFromAnimation
RenderLayer::requestScrollPositionUpdate
AsyncScrollingCoordinator::requestScrollPositionUpdate

In order to break the circle, I'll try to call notifyScrollPositionChanged in AsyncScrollingCoordinator::updateScrollPositionAfterAsyncScroll instead.

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