DO NOT MERGE libutils/Unicode.cpp: Correct length computation and add checks for utf16->utf8 am: 5fce0542b6 am: d0ad14ca21 am: 3841c92912  -s ours am: 247ac63c69  -s ours am: 6179f1a56e am: 451f4b3d04 am: 3c85e4e5e7  -s ours am: baac6666fe am: 2858362ffe
am: 7a0c6bf505

Change-Id: Iea9431a42775b8aa6c89d7b5aaf407692f9e46b4