Added non-prefixed navigator.getGamepads() with updated API

Source/modules/gamepad/WebKitGamepad.idl

Index: Source/modules/gamepad/WebKitGamepad.idl
diff --git a/Source/modules/gamepad/WebKitGamepad.idl b/Source/modules/gamepad/WebKitGamepad.idl
new file mode 100644
index 0000000000000000000000000000000000000000..da51005f63ed3eaba1ef6f71eceb2ba051e3b604
--- /dev/null
+++ b/Source/modules/gamepad/WebKitGamepad.idl
@@ -0,0 +1,15 @@
+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+[
+    WillBeGarbageCollected,
+] interface WebKitGamepad {
+    readonly attribute DOMString id;
+    readonly attribute unsigned long index;
+    readonly attribute boolean connected;
+    readonly attribute unsigned long long timestamp;
+    readonly attribute DOMString mapping;
+    readonly attribute float[] axes;
+    readonly attribute float[] buttons;
+};