1 files changed, 32 insertions, 0 deletions
diff --git a/dom/animation/AnimationComparator.h b/dom/animation/AnimationComparator.h
new file mode 100644
index 0000000000..ff665e82aa
--- /dev/null
+++ b/dom/animation/AnimationComparator.h
@@ -0,0 +1,32 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef mozilla_AnimationComparator_h
+#define mozilla_AnimationComparator_h
+
+namespace mozilla {
+
+// Although this file is called AnimationComparator, we don't actually
+// implement AnimationComparator (to compare const Animation& parameters)
+// since it's not actually needed (yet).
+
+template<typename AnimationPtrType>
+class AnimationPtrComparator {
+public:
+  bool Equals(const AnimationPtrType& a, const AnimationPtrType& b) const
+  {
+    return a == b;
+  }
+
+  bool LessThan(const AnimationPtrType& a, const AnimationPtrType& b) const
+  {
+    return a->HasLowerCompositeOrderThan(*b);
+  }
+};
+
+} // namespace mozilla
+
+#endif // mozilla_AnimationComparator_h