Factor out GamepadCommon base class from Gamepad and WebKitGamepad

Source/modules/gamepad/Gamepad.cpp

 /*
  * Copyright (C) 2011, Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
  *
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 11 matching lines @@
  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
  * DAMAGE.
  */
 
 #include "config.h"
 #include "modules/gamepad/Gamepad.h"
 
 namespace WebCore {
 
 Gamepad::Gamepad()
-    : m_index(0)
-    , m_timestamp(0)
 {
     ScriptWrappable::init(this);
 }
 
-void Gamepad::setAxes(unsigned count, const float* data)
+Gamepad::~Gamepad()
 {
-    m_axes.resize(count);
-    if (count)
-        std::copy(data, data + count, m_axes.begin());
 }
 
 void Gamepad::setButtons(unsigned count, const blink::WebGamepadButton* data)
 {
     if (m_buttons.size() != count) {
         m_buttons.resize(count);
         for (unsigned i = 0; i < count; ++i)
             m_buttons[i] = GamepadButton::create();
     }
     for (unsigned i = 0; i < count; ++i) {
         m_buttons[i]->setValue(data[i].value);
         m_buttons[i]->setPressed(data[i].pressed);
     }
 }
 
 void Gamepad::trace(Visitor* visitor)
 {
     visitor->trace(m_buttons);
 }
 
-Gamepad::~Gamepad()
-{
-}
-
 } // namespace WebCore