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

Source/modules/gamepad/WebKitGamepad.cpp

+// 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.
+
+#include "config.h"
+#include "modules/gamepad/WebKitGamepad.h"
+
+namespace WebCore {
+
+WebKitGamepad::WebKitGamepad() : GamepadBase()
+{
+    ScriptWrappable::init(this);
+}
+
+void WebKitGamepad::buttons(unsigned count, const blink::WebGamepadButton* data)
+{
+    m_buttons.resize(count);
+    for (unsigned i = 0; i < count; ++i)
+        m_buttons[i] = data[i].value;
+}
+
+WebKitGamepad::~WebKitGamepad()
+{
+}
+
+} // namespace WebCore