[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 7f055524ee78af7c9f52934a7ee1a386080c73d8..daa818209a44121db474ad32a663add537f88729 100644
--- a/device/generic_sensor/BUILD.gn
+++ b/device/generic_sensor/BUILD.gn
@@ -59,6 +59,22 @@ component("generic_sensor") {
 
     libs = [ "IOKit.framework" ]
   }
+
+  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) {