[Webkit-unassigned] [Bug 228120] New: Layer tree unfreezing and rendering update scheduling need to work together

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=228120

            Bug ID: 228120
           Summary: Layer tree unfreezing and rendering update scheduling
                    need to work together
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: simon.fraser at apple.com
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    zalan at apple.com

We currently rely on timers to trigger style updates/render tree updates, and this is necessary to trigger unfreezing the layer tree (via visually empty threshold). Ideally the style system would not have any of its own timers; it would just schedule rendering updates. However, TiledCoreAnimationDrawingArea::triggerRenderingUpdate() just bails if the layer tree is frozen.

We need to somehow harmonize layer tree freezing with rendering updates.

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