[Webkit-unassigned] [Bug 256548] New: RemoteLayerTreeDisplayRefreshMonitor::requestRefreshCallback doesn't wait for display link.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=256548

            Bug ID: 256548
           Summary: RemoteLayerTreeDisplayRefreshMonitor::requestRefreshCa
                    llback doesn't wait for display link.
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: mattwoodrow at apple.com
                CC: bfulgham at webkit.org, simon.fraser at apple.com,
                    webkit-bug-importer at group.apple.com, zalan at apple.com

The expectation is that requestRefreshCallback just schedules a displayDidRefresh callback from the display link, but instead it just immediately triggers a rendering update from the drawing area.

This means that the first paint requested after being idle isn't aligned with the display link.

I think we need to instead send an IPC message to the UI process to ensure a displayDidRefresh callback is scheduled.

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