[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..c409cd642a9b9255ea3b311b68852c4ba472aa97 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",
@@ -24,6 +22,8 @@ component("generic_sensor") {
     "platform_sensor_android.h",
     "platform_sensor_linux.cc",
     "platform_sensor_linux.h",
+    "platform_sensor_manager_linux.cc",
+    "platform_sensor_manager_linux.h",
     "platform_sensor_provider.cc",
     "platform_sensor_provider.h",
     "platform_sensor_provider_android.cc",
@@ -36,6 +36,8 @@ component("generic_sensor") {
     "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 +69,16 @@ 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 (is_linux && use_udev) {
+    deps += [
+      "//device/base",
+      "//device/udev_linux",

[Reilly Grant (use Gerrit), 2016/12/08 02:31:14]

You might need to include the *_linux.* sources in this block to avoid link
errors when building without use_udev.

[maksims (do not use this acc), 2016/12/08 18:39:17]

How about including here linux provider and manager only?

+    ]
   }
 
   if (is_win) {