[sensors](Linux) Fix tsan data race in sensor reader

device/generic_sensor/platform_sensor_provider_linux.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 "device/generic_sensor/platform_sensor_provider_linux.h"
 
 #include "base/memory/singleton.h"
+#include "base/task_runner_util.h"
 #include "base/threading/thread.h"
 #include "device/generic_sensor/linux/sensor_data_linux.h"
 #include "device/generic_sensor/platform_sensor_linux.h"
+#include "device/generic_sensor/platform_sensor_reader_linux.h"
 
 namespace device {
 
 // static
 PlatformSensorProviderLinux* PlatformSensorProviderLinux::GetInstance() {
   return base::Singleton<
       PlatformSensorProviderLinux,
       base::LeakySingletonTraits<PlatformSensorProviderLinux>>::get();
 }
 
@@ skipping 31 matching lines @@
     callback.Run(nullptr);
     return;
   }
   SensorDeviceFound(type, std::move(mapping), callback, sensor_device);
 }
 
 void PlatformSensorProviderLinux::SensorDeviceFound(
     mojom::SensorType type,
     mojo::ScopedSharedBufferMapping mapping,
     const PlatformSensorProviderBase::CreateSensorCallback& callback,
-    SensorInfoLinux* sensor_device) {
+    const SensorInfoLinux* sensor_device) {
   DCHECK(CalledOnValidThread());
+  DCHECK(sensor_device);
 
   if (!StartPollingThread()) {
     callback.Run(nullptr);
     return;
   }
 
   scoped_refptr<PlatformSensorLinux> sensor =
       new PlatformSensorLinux(type, std::move(mapping), this, sensor_device,
                               polling_thread_->task_runner());
   callback.Run(sensor);
@@ skipping 127 matching lines @@
     mojom::SensorType type,
     const std::string& device_node) {
   DCHECK(CalledOnValidThread());
   auto it = sensor_devices_by_type_.find(type);
   if (it != sensor_devices_by_type_.end() &&
       it->second->device_node == device_node)
     sensor_devices_by_type_.erase(it);
 }
 
 }  // namespace device