[sensors] Introduce Generic Sensor API interfaces

device/sensors/mojo/sensor_factory_impl.h

Index: device/sensors/mojo/sensor_factory_impl.h
diff --git a/device/sensors/mojo/sensor_factory_impl.h b/device/sensors/mojo/sensor_factory_impl.h
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index 0000000000000000000000000000000000000000..7626d3b927dc90e70e319ffcd2b12d1562e63135
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+++ b/device/sensors/mojo/sensor_factory_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_SENSORS_MOJO_SENSOR_FACTORY_IMPL_H_
+#define DEVICE_SENSORS_MOJO_SENSOR_FACTORY_IMPL_H_
+
+#include "base/macros.h"
+#include "device/sensors/public/interfaces/sensor_factory.mojom.h"
+#include "mojo/public/cpp/bindings/strong_binding.h"
+
+namespace device {
+
+class PlatformSensorProvider;
+
+namespace sensors {
+
+// Implementation of SensorFactory mojo interface.
+// Uses PlatformSensorProvider singleton to create platform specific instances
+// of PlatformSensor which are used by SensorImpl.
+class SensorFactoryImpl final : public SensorFactory {
+ public:
+  static void Create(mojo::InterfaceRequest<SensorFactory> request);
+
+  ~SensorFactoryImpl() override;
+
+ private:
+  explicit SensorFactoryImpl(mojo::InterfaceRequest<SensorFactory> request);
+
+  // SensorFactory implementation.
+  void CreateSensor(SensorType type,
+                    SensorRequest sensor_request,
+                    const CreateSensorCallback& callback) override;
+
+  mojo::Closure connection_error_handler_;
+  mojo::StrongBinding<SensorFactory> binding_;
+  static PlatformSensorProvider* s_provider_;
+  DISALLOW_COPY_AND_ASSIGN(SensorFactoryImpl);
+};
+
+}  // namespace sensors
+}  // namespace device
+
+#endif  // DEVICE_SENSORS_MOJO_SENSOR_FACTORY_IMPL_H_