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Add support for assets in Fuchsia packages (#14654)

Pull code out of flx.dart:assemble() to make flx.dart:buildAssets
which creates the AssetBundle. This will allow us to create just
this instead of an entire FLX.
J
Justin committed
ec76c652bd9f44f6cc4384585583840327c9f1c8
Parent: a448994
Committed by Todd Volkert <tvolkert@users.noreply.github.com> on 2/14/2018, 4:05:05 PM