Add view vc link to codereview.settings
Add view vc link to codereview.settings

This allows the "Committed: <hash>" lines added to codereview
after a `git cl land` to link to the committed revision on github.

R=mgiuca@chromium.org

Review URL: https://codereview.appspot.com/179500043

jackhou-chromium/bitmapper,jackhou-chromium/bitmapper,jackhou-chromium/bitmapper