[Webkit-unassigned] [Bug 129402] New: Web Replay: add a mechanism to disable async scrolling during capture/replay

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=129402

           Summary: Web Replay: add a mechanism to disable async scrolling
                    during capture/replay
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: bburg at apple.com
                CC: timothy at apple.com, ddkilzer at webkit.org,
                    simon.fraser at apple.com, thorton at apple.com


The capture and replay machinery is not thread-safe, so it would be very painful to change it to capture and replay true async scrolling. It would also make recordings unintelligible between async and !async-enabled clients. Instead, we should just force synchronous scrolling when capturing or replaying.

In a branch, I implemented this by adding a flag (set by ReplayController) that contributes to ScrollingCoordinator::synchronousScrollingReasons. Let me know if that's not the right thing to do.

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