Update Gamepad.axes / GamepadButton.value to match the latest specification

LayoutTests/gamepad/gamepad-events-basic.html

Index: LayoutTests/gamepad/gamepad-events-basic.html
diff --git a/LayoutTests/gamepad/gamepad-events-basic.html b/LayoutTests/gamepad/gamepad-events-basic.html
index d4fd3eb2923b80445b2f70da24738fb8020aafe6..869f991195522f17bd0ebeb3a7f9dae37fcf07ec 100644
--- a/LayoutTests/gamepad/gamepad-events-basic.html
+++ b/LayoutTests/gamepad/gamepad-events-basic.html
@@ -13,15 +13,18 @@
             shouldBe("event.__proto__", "GamepadEvent.prototype");
             shouldBe("event.__proto__.__proto__", "Event.prototype");
             shouldBeEqualToString("event.gamepad.id", "MockStick 3000");
-            shouldBe("event.gamepad.buttons.length", "2");
-            shouldBe("event.gamepad.axes.length", "2");
+            shouldBe("event.gamepad.buttons.length", "3");
+            shouldBe("event.gamepad.axes.length", "3");
             shouldBe("event.gamepad.buttons[0].value", "1.0");
             shouldBeTrue("event.gamepad.buttons[0].pressed");
             shouldBe("event.gamepad.buttons[1].value", "0.0");
             shouldBeFalse("event.gamepad.buttons[1].pressed");
-            shouldBe("event.gamepad.axes.length", "2");
+            shouldBe("event.gamepad.axes.length", "3");
+            shouldBe("event.gamepad.buttons[2].value", "0.333333");
+            shouldBeTrue("event.gamepad.buttons[2].pressed");
             shouldBe("event.gamepad.axes[0]", "0.5");
             shouldBe("event.gamepad.axes[1]", "-1.0");
+            shouldBe("event.gamepad.axes[2]", "0.333333");
             gamepadController.disconnect(0);
         }
 
@@ -30,8 +33,8 @@
             shouldBe("event.__proto__", "GamepadEvent.prototype");
             shouldBe("event.__proto__.__proto__", "Event.prototype");
             shouldBeEqualToString("event.gamepad.id", "MockStick 3000");
-            shouldBe("event.gamepad.buttons.length", "2");
-            shouldBe("event.gamepad.axes.length", "2");
+            shouldBe("event.gamepad.buttons.length", "3");
+            shouldBe("event.gamepad.axes.length", "3");
             finishJSTest();
         }
 
@@ -40,12 +43,14 @@
 
         gamepadController.connect(0);
         gamepadController.setId(0, "MockStick 3000");
-        gamepadController.setButtonCount(0, 2);
-        gamepadController.setAxisCount(0, 2);
+        gamepadController.setButtonCount(0, 3);
+        gamepadController.setAxisCount(0, 3);
         gamepadController.setButtonData(0, 0, 1);
         gamepadController.setButtonData(0, 1, 0);
+        gamepadController.setButtonData(0, 2, 0.333333);
         gamepadController.setAxisData(0, 0, .5);
         gamepadController.setAxisData(0, 1, -1.0);
+        gamepadController.setAxisData(0, 2, 0.333333);
         gamepadController.dispatchConnected(0);
     }
     else