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

device/generic_sensor/BUILD.gn

 # 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.
 
 import("//build/config/features.gni")
 
 if (is_android) {
   import("//build/config/android/rules.gni")  # For generate_jni().
 }
 
 source_set("generic_sensor") {
   sources = [
+    "ambient_light_mac.cc",
+    "ambient_light_mac.h",
+    "one_writer_seqlock.cc",
+    "one_writer_seqlock.h",
     "platform_sensor.cc",
     "platform_sensor.h",
+    "platform_sensor_ambient_light_mac.cc",
+    "platform_sensor_ambient_light_mac.h",
     "platform_sensor_android.cc",
     "platform_sensor_android.h",
+    "platform_sensor_mac.cc",
+    "platform_sensor_mac.h",
     "platform_sensor_provider.h",
     "platform_sensor_provider_android.cc",
     "platform_sensor_provider_base.cc",
     "platform_sensor_provider_base.h",
     "platform_sensor_provider_default.cc",
+    "platform_sensor_provider_mac.cc",
+    "platform_sensor_provider_mac.h",
+    "platform_sensor_util_mac.cc",
+    "platform_sensor_util_mac.h",
     "sensor_impl.cc",
     "sensor_impl.h",
     "sensor_provider_impl.cc",
     "sensor_provider_impl.h",
   ]
 
   deps = [
     "//base",
     "//device/generic_sensor/public/interfaces",
   ]
 
   if (is_android) {
     sources += [
       "android/sensors_jni_registrar.cc",
       "android/sensors_jni_registrar.h",
     ]
     sources -= [ "platform_sensor_provider_default.cc" ]
 
     deps += [ ":jni_headers" ]
   }
+
+  if (is_mac) {
+    sources += []
+    sources -= [ "platform_sensor_provider_default.cc" ]
+  }
 }
 
 if (is_android) {
   device_sensors_jni_sources = [
     "android/java/src/org/chromium/device/sensors/PlatformSensor.java",
     "android/java/src/org/chromium/device/sensors/PlatformSensorProvider.java",
   ]
 
   generate_jni("jni_headers") {
     sources = device_sensors_jni_sources
     jni_package = "device"
   }
 
   android_library("java") {
     java_files = device_sensors_jni_sources
 
     deps = [
       "//base:base_java",
       "//device/generic_sensor/public/interfaces:interfaces_java",
     ]
   }
 }