[sensors] Introduce Generic Sensor API interfaces

device/generic_sensor/sensor_provider_impl.h

Index: device/generic_sensor/sensor_provider_impl.h
diff --git a/device/generic_sensor/sensor_provider_impl.h b/device/generic_sensor/sensor_provider_impl.h
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+++ b/device/generic_sensor/sensor_provider_impl.h
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+// 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 DEVICE_GENERIC_SENSOR_SENSOR_PROVIDER_IMPL_H_
+#define DEVICE_GENERIC_SENSOR_SENSOR_PROVIDER_IMPL_H_
+
+#include "base/macros.h"
+#include "device/generic_sensor/public/interfaces/sensor_provider.mojom.h"
+#include "device/generic_sensor/sensor_export.h"
+#include "mojo/public/cpp/bindings/strong_binding.h"
+
+namespace device {
+
+class PlatformSensorProvider;
+
+// Implementation of SensorProvider mojo interface.
+// Uses PlatformSensorProvider singleton to create platform specific instances
+// of PlatformSensor which are used by SensorImpl.
+class SensorProviderImpl final : public mojom::SensorProvider {
+ public:
+  DEVICE_SENSOR_EXPORT static void Create(
+      mojo::InterfaceRequest<mojom::SensorProvider> request);
+
+  ~SensorProviderImpl() override;
+
+ private:
+  SensorProviderImpl(mojo::InterfaceRequest<mojom::SensorProvider> request,
+                     PlatformSensorProvider* provider);
+
+  // SensorProvider implementation.
+  void GetSensor(mojom::SensorType type,
+                 mojom::SensorRequest sensor_request,
+                 const GetSensorCallback& callback) override;
+
+  mojo::StrongBinding<mojom::SensorProvider> binding_;
+  PlatformSensorProvider* provider_;
+  DISALLOW_COPY_AND_ASSIGN(SensorProviderImpl);
+};
+
+}  // namespace device
+
+#endif  // DEVICE_GENERIC_SENSOR_SENSOR_PROVIDER_IMPL_H_