Convert MotionEvent#getSurfaceRotation to ui::Rotation

Because it might have an invalid rotation it needs to return
std::optional<ui::Rotation>, but at least we're using the types
effectively here.

Test: compiles
Change-Id: Ib8bd1cf5c1d910c08fa9ff2a8bb7c74f7c51a71d

core/jni/android_view_MotionEvent.cpp

@@ -763,7 +763,12 @@ static void android_view_MotionEvent_nativeScale(jlong nativePtr, jfloat scale)
 
 static jint android_view_MotionEvent_nativeGetSurfaceRotation(jlong nativePtr) {
     MotionEvent* event = reinterpret_cast<MotionEvent*>(nativePtr);
-    return jint(event->getSurfaceRotation());
+    auto rotation = event->getSurfaceRotation();
+    if (rotation) {
+        return static_cast<jint>(rotation.value());
+    } else {
+        return -1;
+    }
 }
 
 // ----------------------------------------------------------------------------