[Boundary interfaces] Add a package file to hide boundary interfaces am: 8858477884 am: 4027ff7daf
am: 186b21ab8f

Change-Id: I14bd448e101ff61070bd04b4c16436818a70b106
tree: 0219fe732c173ba2dfb7c97695828abb8c27eab7
  1. src/
  2. BUILD.gn
  3. DEPS