Implement MouseEvent buttons attribute.

LayoutTests/fast/events/mouse-event-buttons-attribute-expected.txt

Index: LayoutTests/fast/events/mouse-event-buttons-attribute-expected.txt
diff --git a/LayoutTests/fast/events/mouse-event-buttons-attribute-expected.txt b/LayoutTests/fast/events/mouse-event-buttons-attribute-expected.txt
new file mode 100644
index 0000000000000000000000000000000000000000..f355d2e68233fa97db4d64954810b3f34333328e
--- /dev/null
+++ b/LayoutTests/fast/events/mouse-event-buttons-attribute-expected.txt
@@ -0,0 +1,58 @@
+MouseEvent::dblclick test [leftButton]
+PASS testSet[i].buttons is 1

[Rick Byers, 2014/11/25 17:44:27]

this should be 0 (like mouseup).

[zino, 2014/11/28 12:29:28]

Done.

+
+MouseEvent::click test [leftButton,rightButton]
+PASS testSet[i].buttons is 3

[Rick Byers, 2014/11/25 17:44:27]

and this should be 2.

[zino, 2014/11/28 12:29:28]

Done.

+
+MouseEvent::mousedown test [leftButton,middleButton,rightButton]
+PASS testSet[i].buttons is 7
+
+MouseEvent::mouseup test [leftButton,middleButton,rightButton] -> [leftButton,rightButton]
+PASS testSet[i].buttons is 3
+
+MouseEvent::mousemove test []
+PASS testSet[i].buttons is 0
+
+MouseEvent::mousemove test [leftButton]
+PASS testSet[i].buttons is 1
+
+MouseEvent::mouseenter test [rightButton,middleButton]
+PASS testSet[i].buttons is 6
+
+MouseEvent::mouseleave test [leftButton,rightButton]
+PASS testSet[i].buttons is 3
+
+MouseEvent::mouseover test [leftButton,middleButton]
+PASS testSet[i].buttons is 5
+
+MouseEvent::mouseout test [leftButton]
+PASS testSet[i].buttons is 1
+
+MouseEvent::contextmenu test [rightButton]
+PASS testSet[i].buttons is 2

[Rick Byers, 2014/11/25 17:44:27]

Another example where I think this should be 0, not 2.  I confirmed IE and
Firefox on Windows.

[zino, 2014/11/28 02:37:09]

Here.

[zino, 2014/11/28 12:29:28]

If this is correct, you can see the patch set 7.
But if the value should be 2, you will see the patch set 6.

+
+WheelEvent::mousewheel test [leftButton,rightButton]
+PASS testSet[i].buttons is 3
+
+GestureEvent::dblclick test [leftButton]
+PASS testSet[i].buttons is 1
+
+GestureEvent::click test [leftButton]
+PASS testSet[i].buttons is 1
+
+GestureEvent::mousedown test [leftButton]
+PASS testSet[i].buttons is 1
+
+GestureEvent::mouseup test [leftButton] -> []
+PASS testSet[i].buttons is 0
+
+GestureEvent::mousemove test []
+PASS testSet[i].buttons is 0
+
+GestureEvent::contextmenu test [rightButton]
+PASS testSet[i].buttons is 2
+
+PASS successfullyParsed is true
+
+TEST COMPLETE
+