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Previously, we used runtime deps to collect the shared libraries. That
worked due to some special runtime dependency propagation rules around
shared_library targets. However, this will stop working with the new
linker assisted native feature module approach where some shared
libraries will become action targets. To solve this, this CL

- adds the shared library output file to metadata of each shared_library
  target,

- adds the new partitioned shared library output files to metadata as
  well,

- adds barriers where propagation should be interrupted, and

- adds generated_file targets to read the metadata.



Bug: 980569
Change-Id: Ib3f49a00d04d066a2fc1f0bb916d469adabac447
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1693023
Commit-Queue: Tibor Goldschwendt <tiborg@chromium.org>
Reviewed-by: Andrew Grieve <agrieve@chromium.org>
Cr-Commit-Position: refs/heads/master@{#675773}