[sensors] Ambient light sensor implementation for ChromeOS and Linux.

device/generic_sensor/BUILD.gn

Index: device/generic_sensor/BUILD.gn
diff --git a/device/generic_sensor/BUILD.gn b/device/generic_sensor/BUILD.gn
index 3f0d2e7177a12324a0cc724246cdf801faa99596..0b4363c48756c127650207dbc91632da1209d457 100644
--- a/device/generic_sensor/BUILD.gn
+++ b/device/generic_sensor/BUILD.gn
@@ -40,6 +40,20 @@ source_set("generic_sensor") {
 
     deps += [ ":jni_headers" ]
   }
+
+  if (is_chromeos || is_linux) {
+    sources += [
+      "ambient_light_reader_iio.cc",
+      "ambient_light_reader_iio.h",
+      "platform_sensor_ambient_light_iio.cc",
+      "platform_sensor_ambient_light_iio.h",
+      "platform_sensor_provider_iio.cc",
+      "polling_platform_sensor.cc",
+      "polling_platform_sensor.h",
+    ]
+
+    sources -= [ "platform_sensor_provider_default.cc" ]
+  }
 }
 
 if (is_android) {