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Add a new PAK file for resources in Files app and companion apps like
Audio Player, to host the generated JS modules.

Change ChromeComponentExtensionResourceManager to also load the
resources from this new PAK file.

This is a preparation for converting these apps to JS modules.

Bug: 1133186, 1030998
Change-Id: I00b650d271e758e0cad82a8b4c109f128d0285d2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2503909
Commit-Queue: Karan Bhatia <karandeepb@chromium.org>
Reviewed-by: Karan Bhatia <karandeepb@chromium.org>
Reviewed-by: Jeremie Boulic <jboulic@chromium.org>
Reviewed-by: dpapad <dpapad@chromium.org>
Auto-Submit: Luciano Pacheco <lucmult@chromium.org>
Cr-Commit-Position: refs/heads/master@{#822617}