Fixes edge case where two components of the world ray are both 0. Review URL: http://codereview.chromium.org/3013067
Fixes edge case where two components of the world ray are both 0.
Review URL: http://codereview.chromium.org/3013067

git-svn-id: http://src.chromium.org/svn/trunk/src@55476 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: e0ce3f1ca818d7c0b7cf19e7370703f1c5de82bf
meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser