Emit text direction with selection rectangle

In order to properly perform the smart select animation on right-to-left
and mixed text, we need the information about the direction of the text
that is present below the selection rectangle.

Test: manual - verify selection still works and that the generated
directions match the directions of the text on the screen
Test: bit FrameworksCoreTests:android.text.LayoutTest

Change-Id: I564ee2db59ab583c9bff807ad0d0dfeacaf1386f