commit bd10c52f5efc73f7ffdd611beb14cdd7ce785016
author Evan Rosky <erosky@google.com> Mon Mar 27 15:50:38 2017 -0700
committer Evan Rosky <erosky@google.com> Wed Mar 29 21:56:35 2017 +0000
tree 7e89296a09f54b4723070c232eb383f6c859e6ca
parent 6f3bc05868061cfcc63e8fe8cb00147b03c1c64a

More finishing-up of cluster implementation

Implemented the nextClusterForward attribute (didn't do anything
before).
Fleshed out javadoc links.
Clusters now share sorting with normal focus.
Added sound on cluster navigation.

Bug: 34362469
Bug: 34363357
Bug: 34362653
Bug: 34361907
Bug: 34363159
Test: Added CTS to verify clusters behave the same as normal focus
      wrt user-specified ordering. Tested manually that cluster-
      nav generates sound.

Change-Id: I810acc058d9c1fad4a085d9b7f267e9ec14b33e7