Automaticaly snap back to the previous mode from sliding input (DO NOT MERGE)

This change is back porting of the following changes from Honeycomb.
- I48ea1346: Automaticaly snap back to the previous mode from sliding symbol input
- I9507a98c: Suppress haptic feedback while sliding key input
- Ia06e1abc: Cancel long press timer when sliding key input is not allowed
- I15127929: Fix checking of sliding off from key
- I2518dd1d: Fix potential keyboard layout change bug
- Iffaad1eb: Snap back to the previous keyboard when sliding input is canceled
- Id74bddef: Longer long-press timeout in sliding input

Bug: 3280151
Change-Id: If20b34e8773ebf081c2274d136be4f8ad07ca4fa