Implement SetWrapperReferenceFrom idl attribute within traceWrappers for media tracks

third_party/WebKit/Source/core/html/track/TextTrackList.cpp

Index: third_party/WebKit/Source/core/html/track/TextTrackList.cpp
diff --git a/third_party/WebKit/Source/core/html/track/TextTrackList.cpp b/third_party/WebKit/Source/core/html/track/TextTrackList.cpp
index 8fd0d1fd66a7afc8ce7167b2494be06526b93202..985ffe757ae175daf4a70f24980987424e48874d 100644
--- a/third_party/WebKit/Source/core/html/track/TextTrackList.cpp
+++ b/third_party/WebKit/Source/core/html/track/TextTrackList.cpp
@@ -320,3 +320,14 @@ DEFINE_TRACE(TextTrackList)
     visitor->trace(m_inbandTracks);
     EventTargetWithInlineData::trace(visitor);
 }
+
+DEFINE_TRACE_WRAPPERS(TextTrackList)
+{
+    for (auto track : m_addTrackTracks)
+        visitor->traceWrappers(track);
+    for (auto track : m_elementTracks)
+        visitor->traceWrappers(track);
+    for (auto track : m_inbandTracks)
+        visitor->traceWrappers(track);
+    EventTargetWithInlineData::traceWrappers(visitor);
+}