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

LayoutTests/fast/events/touch/gesture/gesture-tap-down-scroll-no-pinch-expected.txt

Index: LayoutTests/fast/events/touch/gesture/gesture-tap-down-scroll-no-pinch-expected.txt
diff --git a/LayoutTests/fast/events/touch/gesture/gesture-tap-down-scroll-no-pinch-expected.txt b/LayoutTests/fast/events/touch/gesture/gesture-tap-down-scroll-no-pinch-expected.txt
new file mode 100644
index 0000000000000000000000000000000000000000..984d5dca4cc8b2a401bab85319a65f65b6c752b8
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+++ b/LayoutTests/fast/events/touch/gesture/gesture-tap-down-scroll-no-pinch-expected.txt
@@ -0,0 +1,31 @@
+Gestures go here
+Gestures go here
+Tests gesture tapdown behaviour when page is scrollable or not.
+
+On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
+
+
+See http://crbug.com/316974 for details
+
+Verify hover, active aren't initially set (page isn't scrollable).
+PASS isBoxDefault('box') is true
+tapdown on element should activate.
+PASS isBoxHoverActive('box') is true
+showpress on element should keep hover and active.
+PASS isBoxHoverActive('box') is true
+Verify hover, active aren't initially set (overflowBox with scrollable ancestor).
+PASS isBoxDefault('overflowBox') is true
+tapdown on element should not activate.
+PASS isBoxDefault('overflowBox') is true
+showpress on element should activate.
+PASS isBoxHoverActive('overflowBox') is true
+Verify hover, active aren't initially set (page is scrollable).
+PASS isBoxDefault('box') is true
+tapdown on element should not activate.
+PASS isBoxDefault('box') is true
+showpress on element should activate.
+PASS isBoxHoverActive('box') is true
+PASS successfullyParsed is true
+
+TEST COMPLETE
+