Reset drag state variables on mouse up

third_party/WebKit/Source/core/input/EventHandler.h

Index: third_party/WebKit/Source/core/input/EventHandler.h
diff --git a/third_party/WebKit/Source/core/input/EventHandler.h b/third_party/WebKit/Source/core/input/EventHandler.h
index 019e3ee1d79f250cc640c6086c56b32c8f97b3a6..3f44d21a35070704b772816d16cae56856c44d84 100644
--- a/third_party/WebKit/Source/core/input/EventHandler.h
+++ b/third_party/WebKit/Source/core/input/EventHandler.h
@@ -293,8 +293,14 @@ private:
 
     bool handleDrag(const MouseEventWithHitTestResults&, DragInitiator);
     bool tryStartDrag(const MouseEventWithHitTestResults&);
+
+    // Clears drag target and related states. It is called when drag is done or canceled.
     void clearDragState();
 
+    // Resets the state that indicates the next events could cause a drag. It is called when
+    // we realize the next events should not cause drag based on the drag heuristics.
+    void clearDragHeuristicState();
+
     WebInputEventResult dispatchDragSrcEvent(const AtomicString& eventType, const PlatformMouseEvent&);
 
     bool dragHysteresisExceeded(const IntPoint&) const;