[Bug 719758] New: [glimagesink / OSX] videooverlay example fails

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=719758
  GStreamer | gst-plugins-gl | git

           Summary: [glimagesink / OSX] videooverlay example fails
    Classification: Platform
           Product: GStreamer
           Version: git
        OS/Version: Mac OS
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: gst-plugins-gl
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: julien.isorce at gmail.com
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


Created an attachment (id=263384)
 View: https://bugzilla.gnome.org/attachment.cgi?id=263384
 Review: https://bugzilla.gnome.org/review?bug=719758&attachment=263384

cocoa: allow to call set_window_handle before to create glcontext

Regression of cocoa/videooverlay example. It shows a white image.

It fails because set_window_handle is called before to create glcontext. Which
was never the case in 0.10. So the following patch handles this case and
actually allow to call set_window_handle at any time.

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