In Q, the slop is a fixed value calculated based on
TextView.getLineHeight().
In R (before this cl), the slop is a dynamic value based on the height
of the current line.
It's been confirmed as the root cause of the regression bug b/159528374.
This cl changes the slop value back to the fixed value.
Bug: 159528374
Test: Verified locally.
Change-Id: I182d22779f1c1155ae2e0b0deb0455bd270b2fd9
Merged-In: I182d22779f1c1155ae2e0b0deb0455bd270b2fd9
0cb53bb606