LayoutTests/fast/canvas/canvas-composite-alpha.html failed at QtLauncher, as well as it works fine on Safari. Looks like Qt don't fully support composition.
Create a Qt bug to close this one. http://bugreports.qt.nokia.com/browse/QTWEBKIT-149
Created attachment 61890 [details] Proposed patch
Comment on attachment 61890 [details] Proposed patch Clearing flags on attachment: 61890 Committed r63654: <http://trac.webkit.org/changeset/63654>
All reviewed patches have been landed. Closing bug.