Fix antialiasing in WebGL.
Fix antialiasing in WebGL.

Fix command buffer issue where feature_info was being checked for an extension rather than using HasExtension to check the underlying GL implementation.

BUG=59988
TEST=shiny teapot WebGL demo

Review URL: http://codereview.chromium.org/3985001

git-svn-id: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@63765 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser