Fix polygerrit_plugin rule to include deps
Fix polygerrit_plugin rule to include deps

This allows plugins to depend on bower_component libraries (deps of
polygerrit_plugin and polygerrit_bundle are always bower components,
see also the 'zips' variable in _bundle_impl).

This prepares a fix in the image-diff plugin, which had to use an asset
to pull in the resemblejs library, which made it more complicated and
more difficult to import into google3.

Change-Id: Idb562f44f5781b6e588a156a44cd39f853afaec6
(cherry picked from commit 027551fb11bc43897be986a047aa3739e66fef9f)

WANdisco/gerrit,GerritCodeReview/gerrit,GerritCodeReview/gerrit,WANdisco/gerrit,WANdisco/gerrit,WANdisco/gerrit,GerritCodeReview/gerrit,qtproject/qtqa-gerrit,qtproject/qtqa-gerrit,qtproject/qtqa-gerrit,qtproject/qtqa-gerrit,GerritCodeReview/gerrit,WANdisco/gerrit,GerritCodeReview/gerrit,WANdisco/gerrit,qtproject/qtqa-gerrit,WANdisco/gerrit,GerritCodeReview/gerrit,GerritCodeReview/gerrit,GerritCodeReview/gerrit,qtproject/qtqa-gerrit,qtproject/qtqa-gerrit