[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 f8062f74fb411d982573dc935550f97d30821860..de24bad0a459071aa43e598412110cddc8000719 100644
--- a/device/generic_sensor/BUILD.gn
+++ b/device/generic_sensor/BUILD.gn
@@ -50,6 +50,22 @@ source_set("generic_sensor") {
 
     deps += [ "//device/sensors/public/cpp" ]
   }
+
+  if (is_linux) {
+    sources += [
+      "iio/platform_sensor_utils_iio.cc",
+      "iio/platform_sensor_utils_iio.h",
+      "iio/sensor_data_iio.cc",
+      "iio/sensor_data_iio.h",
+      "platform_sensor_iio.cc",
+      "platform_sensor_iio.h",
+      "platform_sensor_provider_iio.cc",
+    ]
+
+    sources -= [ "platform_sensor_provider_default.cc" ]
+
+    deps += [ "//device/sensors/public/cpp" ]
+  }
 }
 
 if (is_android) {