WIP: Add GtkAnimationManager

A private class that keeps track of all in flight animations for a top
level.

gtk/gtkanimationmanager.c

@@ -0,0 +1,37 @@
+#include "config.h"
+
+#include "gtkanimationmanagerprivate.h"
+
+struct _GtkAnimationManager
+{
+  GObject parent_instance;
+
+  GdkFrameClock *frame_clock;
+
+  gint64 last_frame_time;
+};
+
+G_DEFINE_TYPE (GtkAnimationManager, gtk_animation_manager, G_TYPE_OBJECT)
+
+static void
+gtk_animation_manager_class_init (GtkAnimationManagerClass *klass)
+{
+}
+
+static void
+gtk_animation_manager_init (GtkAnimationManager *self)
+{
+}
+
+GtkAnimationManager *
+gtk_animation_manager_new (void)
+{
+  return g_object_new (GTK_TYPE_ANIMATION_MANAGER, NULL);
+}
+
+void
+gtk_animation_manager_set_frame_clock (GtkAnimationManager *self,
+                                       GdkFrameClock       *frame_clock)
+{
+
+}

gtk/gtkanimationmanagerprivate.h

@@ -0,0 +1,38 @@
+/* gtkanimationmanagerprivate.h: Animation manager
+ *
+ * Copyright 2019  GNOME Foundation
+ *
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#include <gtk/gtktypes.h>
+
+G_BEGIN_DECLS
+
+#define GTK_TYPE_ANIMATION_MANAGER (gtk_animation_manager_get_type())
+
+G_DECLARE_FINAL_TYPE (GtkAnimationManager, gtk_animation_manager, GTK, ANIMATION_MANAGER, GObject)
+
+GtkAnimationManager *
+gtk_animation_manager_new (void);
+
+void
+gtk_animation_manager_set_frame_clock (GtkAnimationManager *self,
+                                       GdkFrameClock *frame_clock);
+
+G_END_DECLS

gtk/meson.build

@@ -23,6 +23,7 @@ gtk_private_sources = files([
   'gtkactionobservable.c',
   'gtkactionobserver.c',
   'gtkallocatedbitmask.c',
+  'gtkanimationmanager.c',
   'gtkapplicationaccels.c',
   'gtkapplicationimpl.c',
   'gtkbookmarksmanager.c',