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Previously, Monochrome used its own set of GN targets to package
resources, analogous to the ones used for Chrome (some of which are the
same used for non-Android platforms).  This change moves both variants
to use matching sets of template-generated targets.

Later, when bundle-specific native libraries are added, this common
template can be reused again.

BUG=874584

Change-Id: Ia9c34cb0dfa8754207bdee146dbde47f9aca78d3
Reviewed-on: https://chromium-review.googlesource.com/c/1318418
Commit-Queue: Christopher Grant <cjgrant@chromium.org>
Reviewed-by: agrieve <agrieve@chromium.org>
Cr-Commit-Position: refs/heads/master@{#606060}