[sensors] [mac] Fix ambient light sensor not updating its value when closing the lid with a monitor…

device/generic_sensor/platform_sensor_ambient_light_mac.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_ambient_light_mac.h"
 
 #include <IOKit/IOMessage.h>
 
 #include "base/bind.h"
 #include "device/base/synchronization/shared_memory_seqlock_buffer.h"
@@ skipping 76 matching lines @@
   IONotificationPortSetDispatchQueue(
       light_sensor_port_.get(),
       dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_BACKGROUND, 0));
 
   kern_return_t kr = IOServiceAddInterestNotification(
       light_sensor_port_.get(), light_sensor_service_, kIOGeneralInterest,
       IOServiceCallback, this, light_sensor_notification_.InitializeInto());
   if (kr != KERN_SUCCESS)
     return false;
 
+  kr = IOServiceAddInterestNotification(
+      light_sensor_port_.get(), light_sensor_service_, kIOBusyInterest,
+      IOServiceCallback, this,
+      light_sensor_busy_notification_.InitializeInto());
+  if (kr != KERN_SUCCESS)
+    return false;
+
   kr = IOServiceOpen(light_sensor_service_, mach_task_self(), 0,
                      light_sensor_object_.InitializeInto());
   if (kr != KERN_SUCCESS)
     return false;
 
   bool success = ReadAndUpdate();
   if (!success)
     StopSensor();
 
   return success;
 }
 
 void PlatformSensorAmbientLightMac::StopSensor() {
   light_sensor_port_.reset();
   light_sensor_notification_.reset();
+  light_sensor_busy_notification_.reset();
   light_sensor_object_.reset();
   light_sensor_service_.reset();
   current_lux_ = 0.0;
 }
 
 bool PlatformSensorAmbientLightMac::ReadAndUpdate() {
   uint32_t scalar_output_count = 2;
   uint64_t lux_values[2];
   kern_return_t kr = IOConnectCallMethod(
       light_sensor_object_, LmuFunctionIndex::kGetSensorReadingID, nullptr, 0,
       nullptr, 0, lux_values, &scalar_output_count, nullptr, 0);
 
   if (kr != KERN_SUCCESS)
     return false;
 
   uint64_t mean = (lux_values[0] + lux_values[1]) / 2;
   double lux = LMUvalueToLux(mean);
   if (lux == current_lux_)
     return true;
   current_lux_ = lux;
 
   SensorReading reading;
   reading.timestamp = (base::TimeTicks::Now() - base::TimeTicks()).InSecondsF();
   reading.values[0] = current_lux_;
   UpdateSensorReading(reading, true);
   return true;
 }
 
 }  // namespace device