Implement a JavaScript API for document scanning
Provide an API for callers to list available document scanners,
and to acquire a single-page scan from one such device. This
currently takes advantage of the lorgnette scanning API in
ChromeOS but can be extended to use native document acquisition
APIs on other platforms.
BUG=375334
R=asargent@chromium.org, mef@chromium.org, asvitkine@chromium.org
Review URL: https://codereview.chromium.org/286933006
Cr-Commit-Position: refs/heads/master@{#302122}
32 files changed
