[Webkit-unassigned] [Bug 37291] New: Converting DOM timestamp -> X timestamp in plugin message is wrong

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=37291

           Summary: Converting DOM timestamp -> X timestamp in plugin
                    message is wrong
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Plug-ins
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: evan at chromium.org


When sending a message to a plugin via NPAPI, we need fill in the X event time
as one of the fields of the struct.

In the Chromium, GTK, and Qt ports, the code looks like:
    xbutton.time = event->timeStamp();
But event->timeStamp() is the DOM timestamp of the event, not the X server
time!  The X time is an opaque value which in actuality appears to be
milliseconds since the server started.

This X event time is eventually propagated into the plugin which might use it
to e.g. do a pointer grab, so providing the wrong time can cause grabs to fail
(causing menus to not pop up) as well as race conditions.

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