Add RELATIVE_ORIENTATION sensor implementation on macOS to //device/generic_sensor

device/generic_sensor/BUILD.gn

 # Copyright 2016 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("//build/config/features.gni")
 
 if (is_android) {
   import("//build/config/android/rules.gni")  # For generate_jni().
 }
 
@@ skipping 21 matching lines @@
     "platform_sensor_provider_base.cc",
     "platform_sensor_provider_base.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_relative_orientation_using_accelerometer.cc",
+    "platform_sensor_relative_orientation_using_accelerometer.h",
     "platform_sensor_win.cc",
     "platform_sensor_win.h",
     "sensor_impl.cc",
     "sensor_impl.h",
     "sensor_provider_impl.cc",
     "sensor_provider_impl.h",
   ]
 
   defines = [ "DEVICE_GENERIC_SENSOR_IMPLEMENTATION" ]
 
@@ skipping 77 matching lines @@
     "fake_platform_sensor_provider.cc",
     "fake_platform_sensor_provider.h",
   ]
 
   public_deps = [
     ":generic_sensor",
     "//base",
     "//testing/gmock",
   ]
 }