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 BLINK_PLATFORM_BATTERY_BATTERY_DISPATCHER_PROXY_H_
+#define BLINK_PLATFORM_BATTERY_BATTERY_DISPATCHER_PROXY_H_
+
+#include "device/battery/battery_monitor.mojom.h"
+#include "platform/PlatformExport.h"
+#include "wtf/Noncopyable.h"
+
+namespace blink {
+
+class BatteryStatus;
+
+// 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:
+  class PLATFORM_EXPORT 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:
+  void QueryNextStatus();
+  void OnDidChange(device::BatteryStatusPtr);
+
+  device::BatteryMonitorPtr monitor_;
+  Listener* listener_;
+
+  friend class BatteryDispatcherProxyTest;
+};
+
+}  // namespace blink
+
+#endif  // BLINK_PLATFORM_BATTERY_BATTERY_DISPATCHER_PROXY_H_