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The ChromeOS Gallery, video_player, and audio_player currently pick out
a collection of .js files from various places inside the folder structure
of the ChromeOS files App.

This CL documents where that occurs, with a view to move these, shared
files out to a shared "toolkit" folder higher up in the folder structure.
There is already a "common" folder, but it is within the Files app
subtree and hard to enforce via layering.

It uses GN's "visibility" on the closure targets to detect whether new
dependencies are added.

Bug: 879035
Cq-Include-Trybots: luci.chromium.try:closure_compilation
Change-Id: I6b134ccad20c22ad46372871ab488200d3cbafa1
Reviewed-on: https://chromium-review.googlesource.com/1188735
Commit-Queue: Trent Apted <tapted@chromium.org>
Reviewed-by: calamity <calamity@chromium.org>
Reviewed-by: Noel Gordon <noel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#590186}