[nacltoons] Roll cocos2dx + two bug fixes

Roll cocos2dx to the latest version.

Also fix two bugs relating conversion from design
space to screen space.

BUG=
R=binji@chromium.org

Review URL: https://codereview.chromium.org/17743003

git-svn-id: https://nativeclient-sdk.googlecode.com/svn/trunk/src@1562 050acbb0-2703-11df-ab0a-9f3f633ae91d