Calculates the slop values per upper/lower line height.

Also applies the max/min damping range for slop.
The max/min damping range includes lineHeight + slop.
Note: slop must >= zero.

Bug: 150531840
Test: manual & automated tests
  atest FrameworksCoreTests:EditorCursorDragTest
  atest FrameworksCoreTests:TextViewActivityTest

Change-Id: I26cdf69fd2cf7d4514dd2a902ed34c480c9e8781