Implement dispatchRequestTranslation for getting translation information.

This change doesn't contain the virtual view part and the API, it
will be done in the next change.

Bug: 178046780
Test: manual
Test: atest CtsTranslationTestCases
CTS-Coverage-Bug: 177960696

Change-Id: Idba66a882a90168ecdd93423c0d5d054ab040dad