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Command:
ui/file_manager/base/tools/modules.sh [1] [2]
[1] build directory (e.g. out/Release)
[2] path of JS file to convert (relative to chromium/src)

What does the script do:
1. Update BUILD.gn to enable conversion of JS file.
2. Add exports.
3. Run closure compiler.
4. Parse closure compiler output to retrieve unknown types/variables/functions.
6. Parse these dependencies to find relevant exported types/variables/functions.
7. When found, update BUILD.gn and JS file.

Made sure that:
The script doesn't add any irrelevant import/export.
No duplicate lines are added.

Steps 3 to 7 are ran until the closure compiler output
'X error(s), Y warning(s), Z% typed' doesn't change. The closure compiler
is ran at least 3 times (except if no imports are found), sometimes more.

Bug: 1133186
Change-Id: I1528c8187bc1476d6add1bcb14a0d4fd1b64a4fe
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2550328
Commit-Queue: Jeremie Boulic <jboulic@chromium.org>
Reviewed-by: Luciano Pacheco <lucmult@chromium.org>
Cr-Commit-Position: refs/heads/master@{#834181}