Turn on mac platform files in base_gfx target, add image operations unit test
Turn on mac platform files in base_gfx target, add image operations unit test

git-svn-id: http://src.chromium.org/svn/trunk/src@1186 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: a57738e5aebd8048b95eefcc66bc9519aad19a9f
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