Revert "Do not set docked divider as IME target."

This reverts commit ebe9c0dbebbd8c2a23a76ff827b90e66ce3813bf [1],
because it caused a regression that IME window becomes transparent on
the lock screen (Bug 28013209).

 [1]: I7d406cc88aae40a8b22c1fc1d856ccb7b6bb4558

Bug: 26387930
Bug: 28013209
Change-Id: I11243703030e34b917136b69a35245e9ef73c87c
2 files changed