EmuGL: fix GL view position in window on OS X

The code that creates the GL-accelerated screen view wasn't converting
the upper-left-relative coordinates used within the emulator to the
lower-left coordinates used by the Cocoa APIs on OS X. Since most
skins have the screen view centered vertically this often just
happened to work.

Bug: 5782118
Change-Id: I2f96ee181e850df5676d10a82d86c94421149b40
1 file changed