CRAS: utilize spatial audio state in system state

Utilize spatial audio state in system state to keep the state of UI
selected enablement of spatial audio.

BUG=b:317748801
TEST=FEATURES=test USE=asan emerge-${BOARD} adhd

Change-Id: I663fe01c1a4c5c5d774ffff2e65347ba3f9eb791
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/adhd/+/5523798
Reviewed-by: Hung-Hsien Chen <hunghsienchen@chromium.org>
Tested-by: chromeos-cop-builder@chromeos-cop.iam.gserviceaccount.com <chromeos-cop-builder@chromeos-cop.iam.gserviceaccount.com>
Reviewed-by: Li-Yu Yu <aaronyu@google.com>
Commit-Queue: Eddy Hsu <eddyhsu@chromium.org>

cras/src/server/cras_dbus_control.c

@@ -1519,6 +1519,22 @@ static inline DBusHandlerResult handle_get_number_of_arc_streams(
   return send_int32_reply(conn, message, cras_system_state_num_arc_streams());
 }
 
+static DBusHandlerResult handle_set_spatial_audio_enabled(DBusConnection* conn,
+                                                          DBusMessage* message,
+                                                          void* arg) {
+  int rc;
+  dbus_bool_t enabled;
+
+  rc = get_single_arg(message, DBUS_TYPE_BOOLEAN, &enabled);
+  if (rc) {
+    return rc;
+  }
+
+  cras_s2_set_spatial_audio_enabled(enabled);
+
+  return send_empty_reply(conn, message);
+}
+
 // Handle incoming messages.
 static DBusHandlerResult handle_control_message(DBusConnection* conn,
                                                 DBusMessage* message,
@@ -1752,6 +1768,9 @@ static DBusHandlerResult handle_control_message(DBusConnection* conn,
   } else if (dbus_message_is_method_call(message, CRAS_CONTROL_INTERFACE,
                                          "GetNumberOfArcStreams")) {
     return handle_get_number_of_arc_streams(conn, message, arg);
+  } else if (dbus_message_is_method_call(message, CRAS_CONTROL_INTERFACE,
+                                         "SetSpatialAudio")) {
+    return handle_set_spatial_audio_enabled(conn, message, arg);
   }
 
   return DBUS_HANDLER_RESULT_NOT_YET_HANDLED;