Make Event.deepPath() return an empty array if an event is no longer being dispatched

third_party/WebKit/Source/core/events/Event.h

Index: third_party/WebKit/Source/core/events/Event.h
diff --git a/third_party/WebKit/Source/core/events/Event.h b/third_party/WebKit/Source/core/events/Event.h
index e447f5d3372663c4dcb7d470fa593c6cb6200c7d..f8cc299ef542865db1abf71ca4b2254bcf91cda5 100644
--- a/third_party/WebKit/Source/core/events/Event.h
+++ b/third_party/WebKit/Source/core/events/Event.h
@@ -187,6 +187,7 @@ public:
     void initEventPath(Node&);
 
     WillBeHeapVector<RefPtrWillBeMember<EventTarget>> path(ScriptState*) const;
+    WillBeHeapVector<RefPtrWillBeMember<EventTarget>> deepPath(ScriptState*) const;
 
     bool isBeingDispatched() const { return eventPhase(); }
 
@@ -217,6 +218,11 @@ protected:
     void setCanBubble(bool bubble) { m_canBubble = bubble; }
 
 private:
+    enum EventPathMode {
+        EmptyAfterDispatch,
+        NonEmptyAfterDispatch
+    };
+
     AtomicString m_type;
     unsigned m_canBubble:1;
     unsigned m_cancelable:1;
@@ -240,6 +246,8 @@ private:
     // event timestamp provided by the host OS and reported in the original
     // WebInputEvent instance.
     double m_platformTimeStamp;
+
+    WillBeHeapVector<RefPtrWillBeMember<EventTarget>> pathInternal(ScriptState*, EventPathMode) const;

[kochi, 2016/02/25 09:49:40]

nit: usually method declaration comes after enum and before data members?

It may not be mandatory for blink style, though:
https://www.chromium.org/blink/coding-style

[hayato, 2016/02/25 10:22:55]

Done.

 };
 
 #define DEFINE_EVENT_TYPE_CASTS(typeName) \