diff --git a/widget/xpwidgets/APZCCallbackHelper.cpp b/widget/xpwidgets/APZCCallbackHelper.cpp
index 4b3302636f8..d50f520b83d 100644
--- a/widget/xpwidgets/APZCCallbackHelper.cpp
+++ b/widget/xpwidgets/APZCCallbackHelper.cpp
@@ -133,5 +133,17 @@ APZCCallbackHelper::GetDOMWindowUtils(nsIContent* aContent)
     return utils.forget();
 }
 
+bool
+APZCCallbackHelper::GetScrollIdentifiers(nsIContent* aContent,
+                                         uint32_t* aPresShellIdOut,
+                                         FrameMetrics::ViewID* aViewIdOut)
+{
+    if (!nsLayoutUtils::FindIDFor(aContent, aViewIdOut)) {
+        return false;
+    }
+    nsCOMPtr<nsIDOMWindowUtils> utils = GetDOMWindowUtils(aContent);
+    return utils && (utils->GetPresShellId(aPresShellIdOut) == NS_OK);
+}
+
 }
 }
diff --git a/widget/xpwidgets/APZCCallbackHelper.h b/widget/xpwidgets/APZCCallbackHelper.h
index dbbf09729ef..8b6af6d69e3 100644
--- a/widget/xpwidgets/APZCCallbackHelper.h
+++ b/widget/xpwidgets/APZCCallbackHelper.h
@@ -48,6 +48,12 @@ public:
     /* Get the DOMWindowUtils for the window corresponding to the givent content
        element. This might be an iframe inside the tab, for instance. */
     static already_AddRefed<nsIDOMWindowUtils> GetDOMWindowUtils(nsIContent* aContent);
+
+    /* Get the presShellId and view ID for the given content element, if they can be
+       found. Returns false if the values could not be found, true if they could. */
+    static bool GetScrollIdentifiers(nsIContent* aContent,
+                                     uint32_t* aPresShellIdOut,
+                                     FrameMetrics::ViewID* aViewIdOut);
 };
 
 }