API review requests for the TTS package.

- New TextToSpeechService methods are no longer protected.
- s/getRequiresNetworkConnection/isNetworkConnectionRequired
- New TextToSpeec#play.. methods use a Bundle instead of a HashMap
- New synthesizeToFile(), addSpeech(), addEarcon() methods
take a File instead of a String with filepath.
- TextToSpeechService#s/isValidVoiceName/onIsValidVoiceName

Bug:17389935,17253934
Change-Id: Iec76f59015c34104683c050fe1ff1ceccd604134