[Device Service] Add RELATIVE_ORIENTATION sensor type 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 777cda0bab768c4cfce0dd8b056f1ea2a107366a..8f78f93f666817afe953c6b7c18bdb937985986e 100644
--- a/device/generic_sensor/platform_sensor_provider_mac.cc
+++ b/device/generic_sensor/platform_sensor_provider_mac.cc
@@ -5,6 +5,7 @@
 #include "device/generic_sensor/platform_sensor_provider_mac.h"
 
 #include "base/memory/singleton.h"
+#include "device/generic_sensor/platform_sensor_accelerometer_mac.h"
 #include "device/generic_sensor/platform_sensor_ambient_light_mac.h"
 
 namespace device {
@@ -32,6 +33,12 @@ void PlatformSensorProviderMac::CreateSensorInternal(
       callback.Run(std::move(sensor));
       break;
     }
+    case mojom::SensorType::ACCELEROMETER: {
+      scoped_refptr<PlatformSensor> sensor =
+          new PlatformSensorAccelerometerMac(std::move(mapping), this);
+      callback.Run(std::move(sensor));
+      break;
+    }
     default:
       NOTIMPLEMENTED();
       callback.Run(nullptr);