Faster window resize in a composite manager

[Dennis Kasprzyk]

Hi,

I've implemented my idea from my "Idea how to fix slow window resize in a 
composited desktop" post. My patches add a new function 
XCompositeSetWindowPixmapSize to Xcomposite. The compositing manager can use 
this function to set the window pixmap to the desired size, and the xserver 
will not change the pixmap and it's size during a resize. If 
XCompositeSetWindowPixmapSize is called with 0/0 as size, the xserver 
switches back to it's current pixmap handling and resizes the current pixmap 
back to the window size.

The compiz patches add the functionality to compiz to use the new function. 
Theses patches to compiz are only a prove of concept and are there a some 
things that need to be optimized in compiz with this new function.

I've seen a great resize speed improvement (still not as fast as without 
compiz) with the nvidia binary driver and got also positive feedback from 
tests with the intel driver.

Dennis Kasprzyk
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