Reland of [sensors] Ambient light sensor bindings implementation

third_party/WebKit/Source/modules/sensor/AmbientLightSensorReading.h

+// Copyright 2016 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 AmbientLightSensorReading_h
+#define AmbientLightSensorReading_h
+
+#include "modules/sensor/AmbientLightSensorReadingInit.h"
+#include "modules/sensor/SensorReading.h"
+
+namespace blink {
+
+class AmbientLightSensorReading final : public SensorReading {
+    DEFINE_WRAPPERTYPEINFO();
+public:
+
+    static AmbientLightSensorReading* create(const AmbientLightSensorReadingInit& init)
+    {
+        return new AmbientLightSensorReading(init);
+    }
+
+    static AmbientLightSensorReading* create(SensorProxy* proxy)
+    {
+        return new AmbientLightSensorReading(proxy);
+    }
+
+    ~AmbientLightSensorReading() override;
+
+    double illuminance() const;
+
+    bool isReadingUpdated(const SensorProxy::Reading&) const override;
+
+    DECLARE_VIRTUAL_TRACE();
+
+private:
+    explicit AmbientLightSensorReading(const AmbientLightSensorReadingInit&);
+    explicit AmbientLightSensorReading(SensorProxy*);
+
+private:
+    AmbientLightSensorReadingInit mAmbientLightSensorReadingInit;
+};
+
+} // namepsace blink
+
+#endif // AmbientLightSensorReading_h