Increase priority of GPU presenter threads

Increase priority if GPU presenter threads

This helps keep consistent frame times by moving the StretchRect as early as possible in the queue, so waiting for it to finish doesn't involve waiting for lots of expensive GPU-process commands to finish.

BUG=112349
TEST=

[apatrick_chromium, 2012-03-06 22:20:31]

This seems fine. Can you hold off until I have landed my fix for 116175 though?
It should be in today.

https://chromiumcodereview.appspot.com/9616035/diff/1/ui/gfx/surface/accelera...
File ui/gfx/surface/accelerated_surface_win.cc (right):

https://chromiumcodereview.appspot.com/9616035/diff/1/ui/gfx/surface/accelera...
ui/gfx/surface/accelerated_surface_win.cc:329: device_->SetGPUThreadPriority(7);
This isn't going to give this thread higher GPU priority than the DWM, thereby
bricking lots of machines is it? :) Does 1 work?

[jbauman, 2012-03-06 22:22:39]

On 2012/03/06 22:20:31, apatrick_chromium wrote:
> This seems fine. Can you hold off until I have landed my fix for 116175
though?
> It should be in today.

Sure. Actually, I may hold off on this to make sure it doesn't cause frames to
have alternating lengths.
> 
>
https://chromiumcodereview.appspot.com/9616035/diff/1/ui/gfx/surface/accelera...
> File ui/gfx/surface/accelerated_surface_win.cc (right):
> 
>
https://chromiumcodereview.appspot.com/9616035/diff/1/ui/gfx/surface/accelera...
> ui/gfx/surface/accelerated_surface_win.cc:329:
device_->SetGPUThreadPriority(7);
> This isn't going to give this thread higher GPU priority than the DWM, thereby
> bricking lots of machines is it? :) Does 1 work?

I suspect DWM has priority infinity. However, I can sure try to reduce it.