Move PlatformEventDispatcher implementations to the Oilpan heap.

Source/modules/battery/BatteryDispatcher.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/BatteryDispatcher.h"
 
 #include "modules/battery/BatteryStatus.h"
 #include "platform/NotImplemented.h"
 #include "public/platform/Platform.h"
 
 namespace blink {
 
 BatteryDispatcher& BatteryDispatcher::instance()
 {
-    DEFINE_STATIC_LOCAL(BatteryDispatcher, batteryDispatcher, ());
-    return batteryDispatcher;
+    DEFINE_STATIC_LOCAL(Persistent<BatteryDispatcher>, batteryDispatcher, (new BatteryDispatcher()));
+    return *batteryDispatcher;
 }
 
 BatteryDispatcher::BatteryDispatcher()
 {
 }
 
 BatteryDispatcher::~BatteryDispatcher()
 {
 }
 
+void BatteryDispatcher::trace(Visitor* visitor)
+{
+    visitor->trace(m_batteryStatus);
+    PlatformEventDispatcher::trace(visitor);
+}
+
 void BatteryDispatcher::updateBatteryStatus(const WebBatteryStatus& batteryStatus)
 {
     m_batteryStatus = BatteryStatus::create(batteryStatus.charging, batteryStatus.chargingTime, batteryStatus.dischargingTime, batteryStatus.level);
     notifyControllers();
 }
 
 BatteryStatus* BatteryDispatcher::latestData()
 {
     return m_batteryStatus.get();
 }
 
 void BatteryDispatcher::startListening()
 {
     Platform::current()->startListening(WebPlatformEventBattery, this);
 }
 
 void BatteryDispatcher::stopListening()
 {
     Platform::current()->stopListening(WebPlatformEventBattery);
     m_batteryStatus.clear();
 }
 
 } // namespace blink