Allow scrolls to continue when getting a new content size.

In recordNewContentSize, rather than aborting any scrolls in progress,
find the final coordinates of the scroll and pin them to the new size,
and let the scroll continue.

Fixes http://b/issue?id=2141960

Change-Id: I7bfa444b52e70a0ca817221f379df77efc3496b7
1 file changed