am 48f472f7: am 0369cf98: Cherry pick from Honeycomb Change ID I8d57d12828afab700d76f9b19195817a0adfe080 IAB docs: adds best practices for pending transaction UI

* commit '48f472f748e9404bdb93a93f20a530794f6cdc2f':
  Cherry pick from Honeycomb Change ID I8d57d12828afab700d76f9b19195817a0adfe080 IAB docs: adds best practices for pending transaction UI