Import GMs as Samples

[bsalomon, 2011-10-30 00:40:44]

Copying and pasting from a Sample to a GM or vice-versa is so last week! With
this change you can write a GM and it'll show up in SampleApp (of course you can
always exclude it). GMs now also draw their background separately from their
main content so that they'll work with SampleApp's performance timer.

Next Steps:
Remove samples made redundant
Convert samples to GMs (as appropriate)

[reed1, 2011-10-31 14:09:46]

as I noted in once instance, can we eliminate the call to setBGColor() if we're
setting it to white? I think we follow this in Samples...

LGTM

http://codereview.appspot.com/5332043/diff/2001/gm/hairmodes.cpp
File gm/hairmodes.cpp (left):

http://codereview.appspot.com/5332043/diff/2001/gm/hairmodes.cpp#oldcode95
gm/hairmodes.cpp:95: HairModesGM() {
since this is the default, do we need it here?