Support event handling in SVG's use-element shadow trees

third_party/WebKit/Source/core/events/EventListenerMap.cpp

Index: third_party/WebKit/Source/core/events/EventListenerMap.cpp
diff --git a/third_party/WebKit/Source/core/events/EventListenerMap.cpp b/third_party/WebKit/Source/core/events/EventListenerMap.cpp
index cd0c46291a0292c3aac10e0b1948f4e3460907da..a197f4e1e241f6c7199864d64752479c6c35701d 100644
--- a/third_party/WebKit/Source/core/events/EventListenerMap.cpp
+++ b/third_party/WebKit/Source/core/events/EventListenerMap.cpp
@@ -185,6 +185,28 @@ EventListenerVector* EventListenerMap::find(const AtomicString& eventType) {
   return nullptr;
 }
 
+static void copyListenersNotCreatedFromMarkupToTarget(
+    const AtomicString& eventType,
+    EventListenerVector* listenerVector,
+    EventTarget* target) {
+  for (auto& eventListener : *listenerVector) {
+    if (eventListener.listener()->wasCreatedFromMarkup())
+      continue;
+    AddEventListenerOptionsResolved options = eventListener.options();
+    target->addEventListener(eventType, eventListener.listener(), options);
+  }
+}
+
+void EventListenerMap::copyEventListenersNotCreatedFromMarkupToTarget(
+    EventTarget* target) {
+  checkNoActiveIterators();
+
+  for (const auto& eventListener : m_entries) {
+    copyListenersNotCreatedFromMarkupToTarget(
+        eventListener.first, eventListener.second.get(), target);
+  }
+}
+
 DEFINE_TRACE(EventListenerMap) {
   visitor->trace(m_entries);
 }