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Hook up the Mojo interface provider to the scanning UI and generate
js-lite bindings from scanning.mojom.

A subsequent CL (http://crrev/c/2378138) uses the ScanService Mojo
interface to get the connected scanners and add them to a dropdown in
the UI.

Bug: 1059779
Change-Id: I4270721ac585d668ee1ad5405695590ba78e7711
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2368238Reviewed-by: Jimmy Gong <jimmyxgong@chromium.org>
Reviewed-by: Samuel Huang <huangs@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Commit-Queue: Jesse Schettler <jschettler@chromium.org>
Cr-Commit-Position: refs/heads/master@{#803479}