[Webkit-unassigned] [Bug 144630] New: Some assertion failures in compositing code after r183687

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=144630

            Bug ID: 144630
           Summary: Some assertion failures in compositing code after
                    r183687
    Classification: Unclassified
           Product: WebKit
           Version: 528+ (Nightly build)
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Media Elements
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: roger_fong at apple.com

All that was changed was removal of a z-index: 0 from the media control styles.
This caused 5 tests to start generating assertion failures deep in compositing code, which implies an error with that code somehow.
After a bit of debugging I've decided that I have no idea where to even begin with compositing stuff.

The tests failing are:

compositing/regions/transform-transparent-positioned-video-inside-region.html
compositing/regions/video-in-overflow-region.html
fast/regions/fullscreen/full-screen-video-from-region.html
fast/regions/fullscreen/full-screen-video-in-region-crash.html
fast/regions/inline-block-inside-anonymous-overflow.html

Though they pass in release.
In addition I have not hit the assertion just browsing around various videos using our controls in debug.
I will skip these tests for now.

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