root/chrome/browser/speech/extension_api/

1. extension_manifests_tts_unittest.cc
2. tts_engine_extension_api.cc
3. tts_engine_extension_api.h
4. tts_extension_api.cc
5. tts_extension_api.h
6. tts_extension_api_constants.cc
7. tts_extension_api_constants.h
8. tts_extension_apitest.cc