Create new lcdtext page within gm

Should get this in place before committing http://codereview.appspot.com/4625071 ('Fix build for old versions of freetype without FT_Library_SetLcdFilter')

This CL contains just the image-generating code; the baseline images will be committed separately once this is approved.  In the meanwhile, the buildbot will not turn red just because of missing baseline image files.

[reed1, 2011-06-28 16:00:01]

prolly fine, tho the std way people evaluate lcd text (usually) is black text on
white background.

[epoger, 2011-06-28 16:08:16]

On 2011/06/28 16:00:01, reed1 wrote:
> prolly fine, tho the std way people evaluate lcd text (usually) is black text
on
> white background.

inverted...

[reed1, 2011-06-28 16:17:52]

LGTM

[epoger, 2011-06-28 16:21:07]

committed as r1736

will add baseline images next.