DO NOT MERGE libutils/Unicode.cpp: Correct length computation and add checks for utf16->utf8 am: 2806397d1e am: 8c9d02551c am: 28f28ce635  -s ours am: f611765aaf am: 207717bde6 am: dc5a96f5b3
am: 1aad4b61cb  -s ours

Change-Id: I0082b3b2c0e2347940f666d8a03811abe390de02