[sensors] [mac] Implement ambient light sensor for macOS

device/generic_sensor/ambient_light_mac.h

Index: device/generic_sensor/ambient_light_mac.h
diff --git a/content/browser/device_sensors/ambient_light_mac.h b/device/generic_sensor/ambient_light_mac.h
similarity index 78%
rename from content/browser/device_sensors/ambient_light_mac.h
rename to device/generic_sensor/ambient_light_mac.h
index 6d4af75ce80c20c828a86d0708ec7799cb3a09b2..a40efd1fffd3ec177d1af55cb642dbd90a1333bb 100644
--- a/content/browser/device_sensors/ambient_light_mac.h
+++ b/device/generic_sensor/ambient_light_mac.h
@@ -2,8 +2,8 @@
 // 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_AMBIENT_LIGHT_MAC_H_
-#define CONTENT_BROWSER_DEVICE_SENSORS_AMBIENT_LIGHT_MAC_H_
+#ifndef DEVICE_GENERIC_SENSOR_AMBIENT_LIGHT_MAC_H_
+#define DEVICE_GENERIC_SENSOR_AMBIENT_LIGHT_MAC_H_
 
 #include <IOKit/IOKitLib.h>
 #include <stdint.h>
@@ -12,7 +12,7 @@
 
 #include "base/macros.h"
 
-namespace content {
+namespace device {
 
 // Provides an interface to retrieve ambient light data from MacBooks.
 class AmbientLightSensor {
@@ -20,6 +20,8 @@ class AmbientLightSensor {
   // Create AmbientLightSensor object, return NULL if no valid is sensor found.
   static std::unique_ptr<AmbientLightSensor> Create();
 
+  static double LMUvalueToLux(uint64_t raw_value);
+
   ~AmbientLightSensor();
 
   // Retrieve lux values from Ambient Light Sensor.
@@ -38,6 +40,6 @@ class AmbientLightSensor {
   DISALLOW_COPY_AND_ASSIGN(AmbientLightSensor);
 };
 
-}  // namespace content
+}  // namespace device
 
-#endif  // CONTENT_BROWSER_DEVICE_SENSORS_AMBIENT_LIGHT_MAC_H_
+#endif  // DEVICE_GENERIC_SENSOR_AMBIENT_LIGHT_MAC_H_