Share Gamepad and WebKitGamepad implementation

Source/modules/gamepad/WebKitGamepadList.idl

Index: Source/modules/gamepad/WebKitGamepadList.idl
diff --git a/Source/modules/gamepad/WebKitGamepadList.idl b/Source/modules/gamepad/WebKitGamepadList.idl
new file mode 100644
index 0000000000000000000000000000000000000000..8f0fe49390de06764b32c2e446c1a88548c0c3cb
--- /dev/null
+++ b/Source/modules/gamepad/WebKitGamepadList.idl
@@ -0,0 +1,13 @@
+// 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.
+
+[
+    DoNotGenerateClassBindings,
+    ImplementedAs=GamepadList,
+    NoInterfaceObject,
+    WillBeGarbageCollected,
+] interface WebKitGamepadList {
+    readonly attribute unsigned long length;
+    getter WebKitGamepad item([Default=Undefined] optional unsigned long index);
+};