Send early ShowPress on TapDown when page isn't scrollable/pinchable.

LayoutTests/fast/events/touch/gesture/gesture-tap-down-special-elements-expected.txt

+        
+Tests gesture tapdown behaviour on different form elements.
+
+On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
+
+
+See http://crbug.com/316974 for details
+
+PASS successfullyParsed is true
+
+TEST COMPLETE
+Scroll and Pinch are disabled on the page
+Verify hover, active aren't initially set.
+PASS getHoverActiveState(combobox) is "default"
+tapDown on element should activate.
+PASS getHoverActiveState(combobox) is "hoveredAndActive"
+showPress on element should keep hover and active.
+PASS getHoverActiveState(combobox) is "hoveredAndActive"
+Verify hover, active aren't initially set.
+PASS getHoverActiveState(listbox) is "default"
+tapdown on element should not activate.
+PASS getHoverActiveState(listbox) is "default"
+showPress on element should activate.
+PASS getHoverActiveState(listbox) is "hoveredAndActive"
+Verify hover, active aren't initially set.
+PASS getHoverActiveState(textbox) is "default"
+tapdown on element should not activate.
+PASS getHoverActiveState(textbox) is "default"
+showPress on element should activate.
+PASS getHoverActiveState(textbox) is "hoveredAndActive"
+Verify hover, active aren't initially set.
+PASS getHoverActiveState(textarea) is "default"
+tapdown on element should not activate.
+PASS getHoverActiveState(textarea) is "default"
+showPress on element should activate.
+PASS getHoverActiveState(textarea) is "hoveredAndActive"
+Verify hover, active aren't initially set.
+PASS getHoverActiveState(frameBody) is "default"
+tapdown on element should not activate.
+PASS getHoverActiveState(frameBody) is "default"
+showPress on element should activate.
+PASS getHoverActiveState(frameBody) is "hoveredAndActive"
+