Bug:3085564
In order to treat the selection handles properly, the text in
WebTextView needs to line up with the text in webkit. Use the
line spacing style, or the paint if none provided, to determine
the spacing for WebTextView's Layout. When no line spacing is
provided, use the floating point values of ascent and descent,
rather than the rounded result, to determine spacing.
Requires a change in external/webkit:
https://android-git.corp.google.com/g/#change,80641
Change-Id: I51081835e128a0e938028c7c7aeb5111aa5f072c
1ca5626351