tree f66d827ac5177a7b5dabe2d1137581f816a4488d
parent 6afb72ff1bde8ad53bb0da4b85fa15e73e1bb1fe
author Dan Willemsen <dwillemsen@google.com> 1448494172 -0800
committer Dan Willemsen <dwillemsen@google.com> 1448931814 -0800

Allow wrapping of PackageContext

Turn PackageContext into an interface so that build systems can wrap it
to add more custom helpers.

This does introduce an API change, though it should be fairly simple.
NewPackageContext used to provide an opaque *PackageContext struct, now it
provides a PackageContext interface.

Change-Id: I383c64a303d857ef5e0dec86ad77f791ba4c9639