GitLab

This connects USBDevice interface methods to the embedder.

BUG=492204
R=reillyg@chromium.org

Review URL: https://codereview.chromium.org/1315683002

git-svn-id: svn://svn.chromium.org/blink/trunk@201107 bbb929c8-8fbe-4397-9dbb-9b2b20218538