[sensors](CrOS/Linux) Implement Sensor device manager for sensors

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 a28682d2fd9aba551a35ddabe340fd2b4d4325e4..9d3414fb606aefccdc327b49c8f7d0513f2c8f1a 100644
--- a/device/generic_sensor/BUILD.gn
+++ b/device/generic_sensor/BUILD.gn
@@ -12,8 +12,6 @@ component("generic_sensor") {
   output_name = "generic_sensor"
   sources = [
     "generic_sensor_consts.h",
-    "linux/platform_sensor_utils_linux.cc",
-    "linux/platform_sensor_utils_linux.h",
     "linux/sensor_data_linux.cc",
     "linux/sensor_data_linux.h",
     "platform_sensor.cc",
@@ -30,12 +28,12 @@ component("generic_sensor") {
     "platform_sensor_provider_android.h",
     "platform_sensor_provider_base.cc",
     "platform_sensor_provider_base.h",
-    "platform_sensor_provider_linux.cc",
-    "platform_sensor_provider_linux.h",
     "platform_sensor_provider_mac.cc",
     "platform_sensor_provider_mac.h",
     "platform_sensor_provider_win.cc",
     "platform_sensor_provider_win.h",
+    "platform_sensor_reader_linux.cc",
+    "platform_sensor_reader_linux.h",
     "platform_sensor_reader_win.cc",
     "platform_sensor_reader_win.h",
     "platform_sensor_win.cc",
@@ -67,12 +65,23 @@ component("generic_sensor") {
     deps += [ ":jni_headers" ]
   }
 
-  if (is_mac || is_linux) {
+  if (is_mac) {
     deps += [ "//device/sensors/public/cpp" ]
+    libs = [ "IOKit.framework" ]
   }
 
-  if (is_mac) {
-    libs = [ "IOKit.framework" ]
+  if (use_udev) {
+    deps += [
+      "//device/base",
+      "//device/udev_linux",
+    ]
+
+    sources += [
+      "platform_sensor_manager_linux.cc",
+      "platform_sensor_manager_linux.h",
+      "platform_sensor_provider_linux.cc",
+      "platform_sensor_provider_linux.h",
+    ]
   }
 
   if (is_win) {