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

Source/modules/gamepad/WebKitGamepadList.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/WebKitGamepadList.h"
+
+namespace WebCore {
+
+WebKitGamepadList::~WebKitGamepadList()
+{
+}
+
+void WebKitGamepadList::set(unsigned index, PassRefPtrWillBeRawPtr<WebKitGamepad> gamepad)
+{
+    if (index >= blink::WebGamepads::itemsLengthCap)
+        return;
+    m_items[index] = gamepad;
+}
+
+unsigned WebKitGamepadList::length() const
+{
+    return blink::WebGamepads::itemsLengthCap;
+}
+
+WebKitGamepad* WebKitGamepadList::item(unsigned index)
+{
+    return index < length() ? m_items[index].get() : 0;
+}
+
+void WebKitGamepadList::trace(Visitor* visitor)
+{
+    for (unsigned index = 0; index < blink::WebGamepads::itemsLengthCap; index++) {
+        visitor->trace(m_items[index]);
+    }
+}
+
+} // namespace WebCore