Text selection: When user reaches midpoint jump to end of word

Adjusts the point at which the handles jump to the end of the word.
Previously it was 1 or 2 characters depending on word length, now it
will use the midpoint of the word.

Bug: 21131483
Change-Id: I0d3c1bf4672ae27781318cf2563051cc66bb9f98
1 file changed