Merge \\\\\\\\\"DO NOT MERGE libutils/Unicode.cpp: Correct length computation...

Merge \\\\\\\\\"DO NOT MERGE libutils/Unicode.cpp: Correct length computation and add checks for utf16->utf8\\\\\\\\\" into lmp-dev am: 8d2d6ced  -s ours am: 71da8e75 am: 5e03ed1d am: b00e3603  -s ours am: 72bad95d am: ae21a253 am: 1062106a am: 9d6d33db  -s ours
am: 8c335e28

Change-Id: I4c6a67501017c5e78affc46cba81c4ad439bf6a7