Please keyword dev-qt/qtquickcontrols2. It's only required by qt-creator's tests for now, so it's low priority, but I'm sure many other packages will start using it soon. Thanks.
Also, after keywording, feel free to unmask USE=test for qt-creator in arch/arm/package.use.mask and default/linux/uclibc/arm/package.use.mask
add ~arm, closing.