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Previously, the bundle allotment step didn't account for libraries
packaged into the Trichrome library and, thus, duplicated many libraries
of the Trichrome library into the Trichrome Chrome bundle. This CL fixes
this by teaching the library allotment step about the Trichrome
dependency tree so that it can allot the libraries accordingly. In fact,
with this CL, the library allotment step can now handle any arbitrary
dependency tree. The Trichrome dependency tree looks as follows:

         lib
          |
        base
       /  |  \
  dev_ui  vr  etc.

Note that webview is not yet part of the computation. See
crbug.com/1021565 for more details.

Bug: 1020717, 1021565
Change-Id: I651bcfd1bd15e36b4028b3f535112d3233be2dab
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1898132
Commit-Queue: Tibor Goldschwendt <tiborg@chromium.org>
Reviewed-by: Eric Stevenson <estevenson@chromium.org>
Cr-Commit-Position: refs/heads/master@{#712775}