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Adds associated interface support to modern Mojo JS bindings and
generated JS modules.

Fixed: 914165
Bug: 1004256
Change-Id: I5421ace585ad129374526bc7237980333b141b1e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2611647
Commit-Queue: Ken Rockot <rockot@google.com>
Reviewed-by: Peter Beverloo <peter@chromium.org>
Reviewed-by: Oksana Zhuravlova <oksamyt@chromium.org>
Auto-Submit: Ken Rockot <rockot@google.com>
Cr-Commit-Position: refs/heads/master@{#841192}