Support IMM#updateCursorAnchorInfo in Editor

With this CL, Editor starts calling IMM#updateCursorAnchorInfo
iff IMM#isWatchingCursor(View) returns true. The performance
regression should be negligible when IMM#isWatchingCursor(View)
returns false.

BUG: 14579622
Change-Id: Ib35a6f4201b26d837a6aa07d1204c9eb75404da1
1 file changed