Merge \\\\"DO NOT MERGE libutils/Unicode.cpp: Correct length computation and add checks for utf16->utf8\\\\" into lmp-dev am: 8d2d6cedbb  -s ours am: 71da8e7537 am: 5e03ed1dab
am: b00e3603ef  -s ours

Change-Id: Id73880ce44c4a1cb14c04b6e533e888ac28e1ae0