Added some StretchBench tests for ButtoRow and ButtonColumn
Added some StretchBench tests for ButtoRow and ButtonColumn

Merge-request: 128
Reviewed-by: Jens Bache-Wiig <9cea9d70b08f8210134ec5959114f72bad51ed1d@nokia.com>

mizukusak/qtquickcontrols,jfaust/qtquickcontrols,kobolabs/qtquickcontrols,drgvond/qtquickcontrols,jfaust/qtquickcontrols,kobolabs/qtquickcontrols,richardmg/qtcomponents,mizukusak/qtquickcontrols,drgvond/qtquickcontrols,richardmg/qtcomponents,mizukusak/qtquickcontrols,kobolabs/qtquickcontrols,richardmg/qtcomponents,jfaust/qtquickcontrols,drgvond/qtquickcontrols