libsysprof-profiler: add scaffolding for disk usage

This still needs porting from libsysprof, but this gets the scaffolding in
place to bring over those counters.

src/libsysprof-profile/sysprof-disk-usage.c

@@ -0,0 +1,67 @@
+/* sysprof-disk-usage.c
+ *
+ * Copyright 2023 Christian Hergert <chergert@redhat.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ */
+
+#include "config.h"
+
+#include "sysprof-disk-usage.h"
+#include "sysprof-instrument-private.h"
+
+struct _SysprofDiskUsage
+{
+  SysprofInstrument parent_instance;
+};
+
+struct _SysprofDiskUsageClass
+{
+  SysprofInstrumentClass parent_class;
+};
+
+G_DEFINE_FINAL_TYPE (SysprofDiskUsage, sysprof_disk_usage, SYSPROF_TYPE_INSTRUMENT)
+
+static DexFuture *
+sysprof_disk_usage_record (SysprofInstrument *instrument,
+                           SysprofRecording  *recording,
+                           GCancellable      *cancellable)
+{
+  g_assert (SYSPROF_IS_INSTRUMENT (instrument));
+  g_assert (SYSPROF_IS_RECORDING (recording));
+  g_assert (G_IS_CANCELLABLE (cancellable));
+
+  return dex_future_new_for_boolean (TRUE);
+}
+
+static void
+sysprof_disk_usage_class_init (SysprofDiskUsageClass *klass)
+{
+  SysprofInstrumentClass *instrument_class = SYSPROF_INSTRUMENT_CLASS (klass);
+
+  instrument_class->record = sysprof_disk_usage_record;
+}
+
+static void
+sysprof_disk_usage_init (SysprofDiskUsage *self)
+{
+}
+
+SysprofInstrument *
+sysprof_disk_usage_new (void)
+{
+  return g_object_new (SYSPROF_TYPE_DISK_USAGE, NULL);
+}