Convert device_sensors to use mojo.

content/browser/device_sensors/device_sensor_host.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 CONTENT_BROWSER_DEVICE_SENSORS_DEVICE_SENSOR_HOST_H_
+#define CONTENT_BROWSER_DEVICE_SENSORS_DEVICE_SENSOR_HOST_H_
+
+#include "base/macros.h"
+#include "base/memory/shared_memory.h"
+#include "content/browser/device_sensors/device_sensors_consts.h"
+#include "device/sensors/public/interfaces/light.mojom.h"
+#include "device/sensors/public/interfaces/motion.mojom.h"
+#include "device/sensors/public/interfaces/orientation.mojom.h"
+#include "mojo/public/cpp/bindings/interface_request.h"
+#include "mojo/public/cpp/bindings/strong_binding.h"
+
+namespace content {
+
+// A base class for device sensor related mojo interface implementations.
+template <typename MojoInterface, ConsumerType consumer_type>
+class DeviceSensorHost : public MojoInterface {
+ public:
+  static void Create(mojo::InterfaceRequest<MojoInterface> request);
+
+  // All methods below to be called on the IO thread.
+  ~DeviceSensorHost() override;
+
+ private:
+  explicit DeviceSensorHost(mojo::InterfaceRequest<MojoInterface> request);
+
+  void StartPolling(
+      const typename MojoInterface::StartPollingCallback& callback) override;
+  void StopPolling() override;
+
+  bool is_started_;
+
+  mojo::StrongBinding<MojoInterface> binding_;
+
+  DISALLOW_COPY_AND_ASSIGN(DeviceSensorHost);
+};
+
+using DeviceLightHost =
+    DeviceSensorHost<device::mojom::LightSensor, CONSUMER_TYPE_LIGHT>;
+using DeviceMotionHost =
+    DeviceSensorHost<device::mojom::MotionSensor, CONSUMER_TYPE_MOTION>;
+using DeviceOrientationHost = DeviceSensorHost<device::mojom::OrientationSensor,
+                                               CONSUMER_TYPE_ORIENTATION>;
+using DeviceOrientationAbsoluteHost =
+    DeviceSensorHost<device::mojom::OrientationAbsoluteSensor,
+                     CONSUMER_TYPE_ORIENTATION_ABSOLUTE>;
+
+}  // namespace content
+
+#endif  // CONTENT_BROWSER_DEVICE_SENSORS_DEVICE_SENSOR_HOST_H_