libsysprof-gtk: start on a chart row

This is just playing around to get things to render. There is much to do
to ensure that we interact with this well (and cache some values for
faster generation on allocation changes).

src/libsysprof-gtk/sysprof-mark-chart-row-private.h

@@ -0,0 +1,37 @@
+/* sysprof-mark-chart-row-private.h
+ *
+ * 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
+ */
+
+#pragma once
+
+#include <gtk/gtk.h>
+
+#include <sysprof-analyze.h>
+
+G_BEGIN_DECLS
+
+#define SYSPROF_TYPE_MARK_CHART_ROW (sysprof_mark_chart_row_get_type())
+
+G_DECLARE_FINAL_TYPE (SysprofMarkChartRow, sysprof_mark_chart_row, SYSPROF, MARK_CHART_ROW, GtkWidget)
+
+SysprofMarkCatalog *sysprof_mark_chart_row_get_catalog (SysprofMarkChartRow *self);
+void                sysprof_mark_chart_row_set_catalog (SysprofMarkChartRow *self,
+                                                        SysprofMarkCatalog  *catalog);
+
+G_END_DECLS