Turn on -Wall -Wextra on Mac, and fix all the warnings that crop up for /usr/bin/g++ and Clang 3.3.
BUG=
R=bungeman@google.com

Author: mtklein@google.com

Review URL: https://chromiumcodereview.appspot.com/19569012

git-svn-id: http://skia.googlecode.com/svn/trunk@10255 2bbb7eff-a529-9590-31e7-b0007b416f81
8 files changed