Add API to inform the system a drag is initiated by an
A11yAction#ACTION_DRAG_START.

This allows the system to run a11y-specific code
and still accept drags via touch events when a11y is
enabled.

Test: builds
Bug: 26871588
Change-Id: I40e8f1adf5b773c8fa02173cbd96aa5e9ed54a4d
2 files changed