Related: fdo#87242 init VirtualDevice with size of surface

otherwise vcl's clipping doesn't work quite right when the render text
with vcl apis fallback is used.

Manually forced in my case, but it should happen in practice with vertical
text, so if there is a bug about vertical text not appearing in slideshows then
this is part of the fix for that.

Windows and Mac remain unchanged as initialized with 1, 1. If the same problem
affects those platforms then they'll need to be adjusted to remember their
height/widths from the ctor and those values plugged in here instead

Change-Id: I2f82f0db0cf446d7db21f0a7ee4f8c15c7ebdb42
Related: fdo#87242 merge duplicate clip setup code

favoring the vclcanvas one for the places where
they diverge

Change-Id: I18e3d4e7659ebd4cb90c86718c1b1035671b4be3
Resolves: fdo#87242 reuse vcl clip for cairo during animations

Change-Id: I0a26d4c4092226732620c3852b0402ee45d4fa1d