[sensors] Introduce Generic Sensor API interfaces

device/generic_sensor/sensor_provider_impl.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 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 "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:
+  static void Create(mojo::InterfaceRequest<mojom::SensorProvider> request);
+
+  ~SensorProviderImpl() override;
+
+ private:
+  explicit SensorProviderImpl(
+      mojo::InterfaceRequest<mojom::SensorProvider> request);
+
+  // SensorProvider implementation.
+  void GetSensor(mojom::SensorType type,
+                 mojom::SensorRequest sensor_request,
+                 const GetSensorCallback& callback) override;
+
+  mojo::StrongBinding<mojom::SensorProvider> binding_;
+  static PlatformSensorProvider* s_provider_;

[timvolodine, 2016/08/18 22:52:14]

no need for this pointer if we have PlatformSensorProvider::GetInstance

[Mikhail, 2016/08/19 09:29:56]

Good point. For some reason I did not realize that moving the static pointer
inside the 'PlatformSensorProvider' class itself would make things simpler.
Thanks for the proposal.

+  DISALLOW_COPY_AND_ASSIGN(SensorProviderImpl);
+};
+
+}  // namespace device
+
+#endif  // DEVICE_GENERIC_SENSOR_SENSOR_PROVIDER_IMPL_H_