libsysprof-gtk: break track discover out into seperate module

This stuff can eventually get pretty hairy, so keep it contained and away
from the rest of the session so it may stay tidy.

src/libsysprof-gtk/sysprof-session-discover.c

@@ -0,0 +1,48 @@
+/* sysprof-session-discover.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 <glib/gi18n.h>
+
+#include "sysprof-session-private.h"
+#include "sysprof-track.h"
+
+void
+_sysprof_session_discover_tracks (SysprofSession  *self,
+                                  SysprofDocument *document,
+                                  GListStore      *tracks)
+{
+  g_autoptr(SysprofDocumentCounter) cpu = NULL;
+
+  g_assert (SYSPROF_IS_SESSION (self));
+  g_assert (SYSPROF_IS_DOCUMENT (document));
+  g_assert (G_IS_LIST_STORE (tracks));
+
+  if ((cpu = sysprof_document_find_counter (document, "CPU Percent", "Combined")))
+    {
+      g_autoptr(SysprofTrack) cpu_track = NULL;
+
+      cpu_track = g_object_new (SYSPROF_TYPE_TRACK,
+                                "title", _("CPU Usage"),
+                                NULL);
+      g_list_store_append (tracks, cpu_track);
+    }
+}