Add a Mojo recipe to make mojo fetch-able.
Add a Mojo recipe to make mojo fetch-able.

R=jamesr@chromium.org, agable@chromium.org

Review URL: https://codereview.chromium.org/666293002

git-svn-id: bd64dd6fa6f3f0ed0c0666d1018379882b742947@292598 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

svn2github/chromium-depot-tools,svn2github/chromium-depot-tools,svn2github/chromium-depot-tools