Enabling fast switching for all users.

- Consolidating notion of fast toggling and indicator in the tuner - if 
  it is enabled, the indicator will be enabled
- Upon entering recents, immediately enable the timer to jump to the 
  previous task
- Allowing for multiple durations in the first and subsequent toggles
- Disabling fast-toggle on freeform devices and when touch exploration 
  is enabled
- Simplifying UserInteractionEvent to a reusable event

Change-Id: Id1ca3cd035f4eded5141b2b333a2cab5434b79ee