Add time markers to synthesizeToFile API.

Also rename onUtteranceRangeStart to onRangeStart based on feedback from
the API council.

Bug: 35767714
Bug: 35767290
Test: cts-tradefed run cts-dev --module CtsSpeechTestCases
Change-Id: I2c17a06e401313d4f35e5ec4958c2251c195ef05
11 files changed