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

third_party/WebKit/Source/platform/battery/battery_dispatcher_proxy.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 CONTENT_RENDERER_BATTERY_STATUS_BATTERY_STATUS_DISPATCHER_H_
-#define CONTENT_RENDERER_BATTERY_STATUS_BATTERY_STATUS_DISPATCHER_H_
+#ifndef BLINK_PLATFORM_BATTERY_BATTERY_DISPATCHER_PROXY_H_
+#define BLINK_PLATFORM_BATTERY_BATTERY_DISPATCHER_PROXY_H_
 
-#include "base/compiler_specific.h"
-#include "base/macros.h"
-#include "content/common/content_export.h"
 #include "device/battery/battery_monitor.mojom.h"
+#include "platform/PlatformExport.h"
+#include "wtf/Noncopyable.h"
 
 namespace blink {
-class WebBatteryStatusListener;
-}
 
-namespace content {
+class BatteryStatus;
 
-class CONTENT_EXPORT BatteryStatusDispatcher {
+// This class connects a BatteryDispatcherProxy::Listener to the underlying Mojo
+// service.  Note that currently the access to the Mojo service is limited in
+// platform/.  In future, we'll let classes in core/ and modules/ directly
+// communicate with Mojo, and then, there will be no need to use this proxy
+// class.
+//
+// TODO(yukishiino): Remove this class once Mojo supports WTF-types.
+class PLATFORM_EXPORT BatteryDispatcherProxy {
+  WTF_MAKE_NONCOPYABLE(BatteryDispatcherProxy);
  public:
-  explicit BatteryStatusDispatcher(blink::WebBatteryStatusListener* listener);
-  ~BatteryStatusDispatcher();
+  class Listener {
+   public:
+    virtual ~Listener() = default;
+
+    // This method is called when a new battery status is available.
+    virtual void OnUpdateBatteryStatus(const BatteryStatus&) = 0;
+  };
+
+  explicit BatteryDispatcherProxy(Listener*);
+  ~BatteryDispatcherProxy();
+
+  void StartListening();
+  void StopListening();
 
  private:
-  friend class BatteryStatusDispatcherTest;
-
   void QueryNextStatus();
-  void DidChange(device::BatteryStatusPtr battery_status);
+  void OnDidChange(device::BatteryStatusPtr);
 
   device::BatteryMonitorPtr monitor_;
-  blink::WebBatteryStatusListener* listener_;
+  Listener* listener_;
 
-  DISALLOW_COPY_AND_ASSIGN(BatteryStatusDispatcher);
+  friend class BatteryDispatcherProxyTest;
 };
 
-}  // namespace content
+}  // namespace blink
 
-#endif  // CONTENT_RENDERER_BATTERY_STATUS_BATTERY_STATUS_DISPATCHER_H_
+#endif  // BLINK_PLATFORM_BATTERY_BATTERY_DISPATCHER_PROXY_H_