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
am: e4e22551

Change-Id: I0756cab5ef2d4f3d8becff9e576548cd46de49f8