Convert device_sensors to use mojo.

content/browser/device_sensors/device_sensor_host.cc

+// 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.
+
+#include "content/browser/device_sensors/device_sensor_host.h"
+
+#include "content/browser/device_sensors/device_inertial_sensor_service.h"
+#include "content/public/browser/browser_thread.h"
+
+namespace content {
+
+template <typename MojoInterface, ConsumerType consumer_type>
+void DeviceSensorHost<MojoInterface, consumer_type>::Create(
+    mojo::InterfaceRequest<MojoInterface> request) {
+  new DeviceSensorHost(std::move(request));
+}
+
+template <typename MojoInterface, ConsumerType consumer_type>
+DeviceSensorHost<MojoInterface, consumer_type>::DeviceSensorHost(
+    mojo::InterfaceRequest<MojoInterface> request)
+    : is_started_(false), binding_(this, std::move(request)) {}
+
+template <typename MojoInterface, ConsumerType consumer_type>
+DeviceSensorHost<MojoInterface, consumer_type>::~DeviceSensorHost() {
+  DCHECK_CURRENTLY_ON(BrowserThread::IO);
+  if (is_started_)
+    DeviceInertialSensorService::GetInstance()->RemoveConsumer(consumer_type);

[dcheng, 2016/07/04 03:39:49]

Is the name for this still accurate? It looks like 'light sensors' are an
explicit instantiation of this template, and in my mind, that's not an inertial
sensor.

(I guess this is from pre-existing code, but perhaps it would be nice to clean
it up in a followup maybe?)

[Sam McNally, 2016/07/04 08:31:38]

I think you're right.
I'll rename it in a followup.

+}
+
+template <typename MojoInterface, ConsumerType consumer_type>
+void DeviceSensorHost<MojoInterface, consumer_type>::DeviceSensorHost::
+    StartPolling(const typename MojoInterface::StartPollingCallback& callback) {
+  DCHECK_CURRENTLY_ON(BrowserThread::IO);
+  DCHECK(!is_started_);
+  if (is_started_)
+    return;
+  is_started_ = true;
+  DeviceInertialSensorService::GetInstance()->AddConsumer(consumer_type);
+  callback.Run(
+      DeviceInertialSensorService::GetInstance()->GetSharedMemoryHandle(
+          consumer_type));
+}
+
+template <typename MojoInterface, ConsumerType consumer_type>
+void DeviceSensorHost<MojoInterface,
+                      consumer_type>::DeviceSensorHost::StopPolling() {
+  DCHECK_CURRENTLY_ON(BrowserThread::IO);
+  DCHECK(is_started_);
+  if (!is_started_)
+    return;
+  is_started_ = false;
+  DeviceInertialSensorService::GetInstance()->RemoveConsumer(consumer_type);
+}
+
+template class DeviceSensorHost<device::mojom::LightSensor,
+                                CONSUMER_TYPE_LIGHT>;
+template class DeviceSensorHost<device::mojom::MotionSensor,
+                                CONSUMER_TYPE_MOTION>;
+template class DeviceSensorHost<device::mojom::OrientationSensor,
+                                CONSUMER_TYPE_ORIENTATION>;
+template class DeviceSensorHost<device::mojom::OrientationAbsoluteSensor,
+                                CONSUMER_TYPE_ORIENTATION_ABSOLUTE>;
+
+}  // namespace content