Turn more warnings on, including

- unused functions
- unused locals
- sign mismatch
- missing function prototypes
- missing newline at end of file
- 64 to 32 bit truncation
Review URL: https://codereview.appspot.com/6307043

git-svn-id: http://skia.googlecode.com/svn/trunk@4190 2bbb7eff-a529-9590-31e7-b0007b416f81
1 file changed