[Webkit-unassigned] [Bug 87602] New: [BlackBerry] Make it possible to manipulate layers on the compositing thread

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=87602

           Summary: [BlackBerry] Make it possible to manipulate layers on
                    the compositing thread
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebKit BlackBerry
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: anilsson at rim.com
                CC: rwlbuis at gmail.com, staikos at kde.org, atreat at rim.com,
                    tonikitoo at webkit.org, mifenton at rim.com,
                    kpiascik at rim.com, mlattanzio at rim.com
        Depends on: 87601


Normally, layers are manipulated on the WebKit thread, and the changes are
    synced to the compositing thread during the next accelerated compositing commit
    operation.

    However, for overlay layers the ability to manipulate layers on the compositing
    thread is necessary for adequate user interface responsiveness.

    Two mechanisms are added:
    1. For a layer with a WebKit-thread counterpart, you can temporarily override
    attributes or add animations whose output override attributes.
    2. For a layer with no WebKit-thread counterpart, you can now directly set the
    compositing thread values for attributes. If you attempt to do this for layers
    that do have a WebKit-thread counterpart, the compositing thread values will
    be overwritten at the time of the next commit, which makes the override
    mechanism more useful there.

    PR #156812


Please note that this has not been internally reviewed yet, so it needs actual review. And also, it has a dependency that needs to be landed first.

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