Fixed warning from Core Graphics related to zero-width or zero-height

Fixed warning from Core Graphics related to zero-width or zero-height
IOSurfaces and textures by forcing the IOSurface and its associated
texture to have a minimum width and height of 1.

Lie to callers about this fact since such accelerated surfaces'
contents will never be displayed to the screen.

Tested with Gmail; no more warnings. Also tested YouTube with both
Flash and HTML5 videos.

BUG=86326
TEST=none
Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=89398

[Ken Russell (switch to Gerrit), 2011-06-16 20:57:16]

Please review. Thanks.

[Nico, 2011-06-16 21:01:03]

LGTM

Thanks!