Re-add extra hit-tests on GestureTap

LayoutTests/fast/events/touch/gesture/gesture-tap-paragraph-end-expected.txt

+Tap to the
+right:
+
+Verifies that tapping in the whitespace at the end of a paragraph sends mouse events properly to the paragraph node (even though there are no text line boxes here). http://crbug.com/398205
+
+On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
+
+
+PASS point.x is > span.getBoundingClientRect().right
+PASS document.elementFromPoint(point.x, point.y).id is "target"
+Sending GestureTapDown
+Sending GestureShowPress
+Sending GestureTap
+Received mousemove on target
+PASS event.target.id is "target"
+PASS document.elementFromPoint(event.clientX, event.clientY).id is "target"
+Received mousedown on target
+PASS event.target.id is "target"
+PASS document.elementFromPoint(event.clientX, event.clientY).id is "target"
+Received mouseup on target
+PASS event.target.id is "target"
+PASS document.elementFromPoint(event.clientX, event.clientY).id is "target"
+Received click on target
+PASS event.target.id is "target"
+PASS document.elementFromPoint(event.clientX, event.clientY).id is "target"
+PASS successfullyParsed is true
+
+TEST COMPLETE
+