am 34997731: cherrypick from lmp-docs docs: Add Channel API summary for Wear. Original Change-Id: I447e58264e142a5e04aaf520d31dc4ced2506ecb

* commit '34997731954015ce4e946ce696d487db17b848c1':
  cherrypick from lmp-docs docs: Add Channel API summary for Wear. Original Change-Id: I447e58264e142a5e04aaf520d31dc4ced2506ecb