enable chromium_code=1 to increase warning level.  this will enable the same warnings as when built within chrome, helping avoid breakage in future. BUG=432 TESTED=local windows build R=bcornell@google.com
enable chromium_code=1 to increase warning level.  this will enable the same warnings as when built within chrome, helping avoid breakage in future.
BUG=432
TESTED=local windows build
R=bcornell@google.com

Review URL: https://webrtc-codereview.appspot.com/49839004
tony2012/libyuv,tony2012/libyuv,tony2012/libyuv