Merge changes Idbee5519,I4114923e,I29373877,If03d0518,If3bd3301

* changes:
  gn2bp:
  gn2bp: Add source genrule for proto to the srcs
  gn2bp: Remove srcs from out/test
  gn2bp: Skip generating pb2.py files
  gn2bp: Split genrule for proto to source and header