Add Dispatcher class to the Battery Status API module.

Source/modules/battery/BatteryManager.h

Index: Source/modules/battery/BatteryManager.h
diff --git a/Source/modules/battery/BatteryManager.h b/Source/modules/battery/BatteryManager.h
index 4df04971940bb785332356180875e59d4c6b5e2f..4ddaa3462455f23d13da73d57dfec23dfc16f675 100644
--- a/Source/modules/battery/BatteryManager.h
+++ b/Source/modules/battery/BatteryManager.h
@@ -8,6 +8,7 @@
 #include "core/dom/ContextLifecycleObserver.h"
 #include "core/dom/Document.h"
 #include "core/events/EventTarget.h"
+#include "core/frame/DeviceSensorEventController.h"
 #include "heap/Handle.h"
 #include "modules/battery/BatteryStatus.h"
 
@@ -15,7 +16,7 @@ namespace WebCore {
 
 class Navigator;
 
-class BatteryManager FINAL : public RefCountedWillBeRefCountedGarbageCollected<BatteryManager>, public ContextLifecycleObserver, public EventTargetWithInlineData {
+class BatteryManager FINAL : public RefCountedWillBeRefCountedGarbageCollected<BatteryManager>, public ActiveDOMObject, public DeviceSensorEventController, public EventTargetWithInlineData {
     DEFINE_EVENT_TARGET_REFCOUNTING(RefCountedWillBeRefCountedGarbageCollected<BatteryManager>);
 public:
     virtual ~BatteryManager();
@@ -35,14 +36,27 @@ public:
     DEFINE_ATTRIBUTE_EVENT_LISTENER(dischargingtimechange);
     DEFINE_ATTRIBUTE_EVENT_LISTENER(levelchange);
 
-    void didChangeBatteryStatus(PassRefPtr<Event>, PassOwnPtr<BatteryStatus>);
+    void didChangeBatteryStatus(PassRefPtr<Event>, PassRefPtr<BatteryStatus>);

[sof, 2014/04/07 12:52:44]

Change PassRefPtr<Event> to PassRefPtrWillBeRawPtr<Event>

+
+    // ActiveDOMObject implementation.
+    virtual bool canSuspend() const { return true; }
+    virtual void suspend() OVERRIDE;
+    virtual void resume() OVERRIDE;
+    virtual void stop() OVERRIDE;
+
+    // DeviceSensorEventController
+    virtual void registerWithDispatcher() OVERRIDE FINAL;

[sof, 2014/04/07 12:52:44]

Given that the class is decorated with FINAL, this shouldn't be needed.

+    virtual void unregisterWithDispatcher() OVERRIDE FINAL;
+    virtual bool hasLastData() OVERRIDE FINAL;
+    virtual PassRefPtr<Event> getLastEvent() OVERRIDE FINAL;

[sof, 2014/04/07 12:52:44]

Change the return type to PassRefPtrWillBeRawPtr<Event> to make this compile
with Oilpan enabled (and override the method on DeviceSensorEventController.)

+    virtual bool isNullEvent(Event*) OVERRIDE FINAL;
 
     void trace(Visitor*) { }
 
 private:
     explicit BatteryManager(ExecutionContext*);
 
-    OwnPtr<BatteryStatus> m_batteryStatus;
+    RefPtr<BatteryStatus> m_batteryStatus;
 };
 
 }