diff -r 000000000000 -r 6474c204b198 dom/smil/nsSMILTimeValue.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dom/smil/nsSMILTimeValue.cpp	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,40 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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/. */
+
+#include "nsSMILTimeValue.h"
+
+nsSMILTime nsSMILTimeValue::kUnresolvedMillis = INT64_MAX;
+
+//----------------------------------------------------------------------
+// nsSMILTimeValue methods:
+
+static inline int8_t
+Cmp(int64_t aA, int64_t aB)
+{
+  return aA == aB ? 0 : (aA > aB ? 1 : -1);
+}
+
+int8_t
+nsSMILTimeValue::CompareTo(const nsSMILTimeValue& aOther) const
+{
+  int8_t result;
+
+  if (mState == STATE_DEFINITE) {
+    result = (aOther.mState == STATE_DEFINITE)
+           ? Cmp(mMilliseconds, aOther.mMilliseconds)
+           : -1;
+  } else if (mState == STATE_INDEFINITE) {
+    if (aOther.mState == STATE_DEFINITE)
+      result = 1;
+    else if (aOther.mState == STATE_INDEFINITE)
+      result = 0;
+    else
+      result = -1;
+  } else {
+    result = (aOther.mState != STATE_UNRESOLVED) ? 1 : 0;
+  }
+
+  return result;
+}