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This CL restructures PAK inclusion for DevUI pages to be hierarchical:
* Each DevUI page has its own "atomic" PAK files (currently only done
  for chrome://bluetooth-internals).
* On *all* architectures, pages intended for the DevUI DFM are repacked
  into dev_ui_page_resources.pak.
* For non-Android, or if DevUI DFM is off, dev_ui_page_resources.pak is
  simply repacked with other resources to form resources.pak. This
  produces the same result as before.
* For Android with DevUI DFM on (APK and bundles):
  * dev_ui_page_resources.pak and DevUI support resources are repacked
    into dev_ui_resources.pak.
  * Remaining resources go into resources.pak.

This CL also centralizes atomic PAK files targets and deps into a single
target (dev_ui_paks) in chrome/browser/resources/BUILD.gn, making it
easier to edit dev_ui_page_resources.pak contents.

Change-Id: Ieeaa18a322b46ed5102b2cbec20fab44a2b4ab82
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1785007Reviewed-by: Tibor Goldschwendt <tiborg@chromium.org>
Reviewed-by: Dan Beam <dbeam@chromium.org>
Reviewed-by: Andrew Grieve <agrieve@chromium.org>
Commit-Queue: Samuel Huang <huangs@chromium.org>
Cr-Commit-Position: refs/heads/master@{#699997}