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

device/generic_sensor/platform_sensor_provider_mac.cc

Index: device/generic_sensor/platform_sensor_provider_mac.cc
diff --git a/device/generic_sensor/platform_sensor_provider_mac.cc b/device/generic_sensor/platform_sensor_provider_mac.cc
index f88a34d47179e404446a16d50d3514af39963e9e..0a0bab14179b7ab811d5bf4869af7c8b8dfc86ac 100644
--- a/device/generic_sensor/platform_sensor_provider_mac.cc
+++ b/device/generic_sensor/platform_sensor_provider_mac.cc
@@ -7,6 +7,7 @@
 #include "base/memory/singleton.h"
 #include "device/generic_sensor/platform_sensor_accelerometer_mac.h"
 #include "device/generic_sensor/platform_sensor_ambient_light_mac.h"
+#include "device/generic_sensor/platform_sensor_relative_orientation_using_accelerometer.h"
 
 namespace device {
 
@@ -38,6 +39,12 @@ void PlatformSensorProviderMac::CreateSensorInternal(
           std::move(mapping), this));
       break;
     }
+    case mojom::SensorType::RELATIVE_ORIENTATION: {
+      callback.Run(base::MakeRefCounted<
+                   PlatformSensorRelativeOrientationUsingAccelerometer>(
+          std::move(mapping), this));
+      break;
+    }
     default:
       NOTIMPLEMENTED();
       callback.Run(nullptr);