Change UrlSpanFactory to a Function

Test: atest android.text.util.cts.LinkifyTest
Test: atest android.text.util.LinkifyTest

Bug: 28536972
Bug: 32613009
Bug: 29150779
Bug: 112303511
Change-Id: I73976e3e0bea6e61804d7735fb5901c91cb53758
2 files changed