diff -r 000000000000 -r 6474c204b198 layout/base/PositionedEventTargeting.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/layout/base/PositionedEventTargeting.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,32 @@
+/* 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_PositionedEventTargeting_h
+#define mozilla_PositionedEventTargeting_h
+
+#include <stdint.h>
+#include "mozilla/EventForwards.h"
+
+class nsIFrame;
+struct nsPoint;
+
+namespace mozilla {
+
+enum {
+  INPUT_IGNORE_ROOT_SCROLL_FRAME = 0x01
+};
+/**
+ * Finds the target frame for a pointer event given the event type and location.
+ * This can look for frames within a rectangle surrounding the actual location
+ * that are suitable targets, to account for inaccurate pointing devices.
+ */
+nsIFrame*
+FindFrameTargetedByInputEvent(const WidgetGUIEvent* aEvent,
+                              nsIFrame* aRootFrame,
+                              const nsPoint& aPointRelativeToRootFrame,
+                              uint32_t aFlags = 0);
+
+}
+
+#endif /* mozilla_PositionedEventTargeting_h */