The transparent frame background is painted opaque because
OutputDevice::DrawTransparent() records a MetaTransparentAction
instead of returning early.

Note that master and 4.4 use drawinglayer to paint backgrounds
so the problem is only visible in 4.3.

(regression from 36b59f2efc2bfb2c9256c39eb5687808deb)

Change-Id: Ide7a076b72123097a9fe099b96d36cda7f7bb082