Introduce PlatformEvent to handle Device events, Battery events and Gamepad events.

Source/modules/battery/BatteryManager.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/battery/BatteryManager.h"
 
 #include "core/dom/Document.h"
 #include "core/events/Event.h"
 #include "modules/battery/BatteryDispatcher.h"
 #include "modules/battery/BatteryStatus.h"
 #include "platform/RuntimeEnabledFeatures.h"
 
 namespace blink {
 
 PassRefPtrWillBeRawPtr<BatteryManager> BatteryManager::create(ExecutionContext* context)
 {
     RefPtrWillBeRawPtr<BatteryManager> batteryManager(adoptRefWillBeRefCountedGarbageCollected(new BatteryManager(context)));
     batteryManager->suspendIfNeeded();
     return batteryManager.release();
 }
 
 BatteryManager::~BatteryManager()
 {
     stopUpdating();
 }
 
 BatteryManager::BatteryManager(ExecutionContext* context)
     : ActiveDOMObject(context)
-    , DeviceEventControllerBase(toDocument(context)->page())
+    , PlatformEventController(toDocument(context)->page())
     , m_batteryStatus(BatteryStatus::create())
     , m_state(NotStarted)
 {
     ScriptWrappable::init(this);
 }
 
 ScriptPromise BatteryManager::startRequest(ScriptState* scriptState)
 {
     if (m_state == Pending)
         return m_resolver->promise();
@@ skipping 110 matching lines @@
     return m_state == Resolved && hasEventListeners();
 }
 
 void BatteryManager::trace(Visitor* visitor)
 {
     visitor->trace(m_batteryStatus);
     EventTargetWithInlineData::trace(visitor);
 }
 
 } // namespace blink