account for matrix transforms in getAbsoluteBounds

Issue: BHV-15490
Enyo-DCO-1.1-Signed-off-by: Ryan Duffy (ryan.duffy@lge.com)
use style property for bounds with computed style fallback

The style property is often sufficient but if the transform is specified in a
unit other than 'px', fall back to computed style to get the pixel value.

Issue: BHV-14590
Enyo-DCO-1.1-Signed-off-by: Ryan Duffy (ryan.duffy@lge.com)
Merge pull request #877 from enyojs/BHV-15490-ryanjduffy

Fixes BHV-15490

Reviewed-By: Krishna Rangarajan (krishna.rangarajan@lge.com)
Integrated-By: Aaron Tam (aaron.tam@lge.com)