-Wall -Wextra and -Wno-unused in common.gypi. This revealed a lot of warnings
(and some actual bugs), all of which I fixed here. This is pretty mindless
stuff for the most part (order of intialization, missing initializers, && within
||, etc), but will allow us to build cleanly with -Wall and -Wextra (and
-Werror, if we so choose).
I put defaults into switches that were missing cases. I could put in the actual
missing enums instead if that's desired. I could also assert on missing enums
instead of break, if that's desired. I wasn't sure how to test the stuff in
"animator", so that should be looked at a bit more closely.
Review URL: http://codereview.appspot.com/4547055/
git-svn-id: http://skia.googlecode.com/svn/trunk@1386 2bbb7eff-a529-9590-31e7-b0007b416f81
