Migrates battery_status from content/renderer/ to WebKit/platform/

third_party/WebKit/Source/modules/battery/BatteryDispatcher.h

 // 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.
 
 #ifndef BatteryDispatcher_h
 #define BatteryDispatcher_h
 
 #include "core/frame/PlatformEventDispatcher.h"
+#include "modules/ModulesExport.h"
 #include "modules/battery/BatteryManager.h"
-#include "modules/battery/BatteryStatus.h"
-#include "public/platform/WebBatteryStatusListener.h"
+#include "platform/battery/BatteryStatusDispatcher.h"
+#include "platform/battery/BatteryStatusListener.h"
+#include "wtf/OwnPtr.h"
 
 namespace blink {
 
-class WebBatteryStatus;
-
-class BatteryDispatcher final : public GarbageCollectedFinalized<BatteryDispatcher>, public PlatformEventDispatcher, public WebBatteryStatusListener {
+class MODULES_EXPORT BatteryDispatcher final : public GarbageCollectedFinalized<BatteryDispatcher>, public PlatformEventDispatcher, public BatteryStatusListener {
     USING_GARBAGE_COLLECTED_MIXIN(BatteryDispatcher);
 public:
     static BatteryDispatcher& instance();
     ~BatteryDispatcher() override;
 
-    BatteryStatus* latestData();
+    const BatteryStatus* latestData() const
+    {
+        return m_hasLatestData ? &m_batteryStatus : nullptr;
+    }
 
-    // Inherited from WebBatteryStatusListener.
-    void updateBatteryStatus(const WebBatteryStatus&) override;
-
-    DECLARE_VIRTUAL_TRACE();
+    // Inherited from BatteryStatusListener.
+    void onUpdateBatteryStatus(const BatteryStatus&) override;
 
 private:
     BatteryDispatcher();
 
     // Inherited from PlatformEventDispatcher.
     void startListening() override;
     void stopListening() override;
 
-    Member<BatteryStatus> m_batteryStatus;
+    BatteryStatus m_batteryStatus;
+    bool m_hasLatestData;
+    OwnPtr<BatteryStatusDispatcher> m_batteryStatusDispatcher;
 };
 
 } // namespace blink
 
 #endif // BatteryDispatcher_h