Mojo JS bindings: duplicate the bindings files into src/mojo/public/js/new_bindings.

New module-loading approach will be developed on this copy. The original code
will be removed after all user code is switched to the new approach.

BUG=699569

Review-Url: https://codereview.chromium.org/2736273002
Cr-Commit-Position: refs/heads/master@{#455492}
10 files changed