1 files changed, 21 insertions, 0 deletions
diff --git a/dom/performance/PerformanceEntry.h b/dom/performance/PerformanceEntry.h
index bc4f84f1c..0af9f669e 100644
--- a/dom/performance/PerformanceEntry.h
+++ b/dom/performance/PerformanceEntry.h
@@ -90,6 +90,27 @@ protected:
   nsString mEntryType;
 };
 
+// Helper classes
+class MOZ_STACK_CLASS PerformanceEntryComparator final
+{
+public:
+  bool Equals(const PerformanceEntry* aElem1,
+              const PerformanceEntry* aElem2) const
+  {
+    MOZ_ASSERT(aElem1 && aElem2,
+               "Trying to compare null performance entries");
+    return aElem1->StartTime() == aElem2->StartTime();
+  }
+
+  bool LessThan(const PerformanceEntry* aElem1,
+                const PerformanceEntry* aElem2) const
+  {
+    MOZ_ASSERT(aElem1 && aElem2,
+               "Trying to compare null performance entries");
+    return aElem1->StartTime() < aElem2->StartTime();
+  }
+};
+
 } // namespace dom
 } // namespace mozilla