Implement SetWrapperReferenceFrom idl attribute within traceWrappers for media tracks

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

Index: third_party/WebKit/Source/core/html/track/TextTrack.cpp
diff --git a/third_party/WebKit/Source/core/html/track/TextTrack.cpp b/third_party/WebKit/Source/core/html/track/TextTrack.cpp
index 259ac3fe8444458792a82f92fa8fd00b825b5c06..13b308e3a47740edf5e45fb1c6e7fedf2fc7e37d 100644
--- a/third_party/WebKit/Source/core/html/track/TextTrack.cpp
+++ b/third_party/WebKit/Source/core/html/track/TextTrack.cpp
@@ -491,4 +491,9 @@ DEFINE_TRACE(TextTrack)
     EventTargetWithInlineData::trace(visitor);
 }
 
+DEFINE_TRACE_WRAPPERS(TextTrack)
+{
+    visitor->traceWrappers(m_cues);
+    EventTargetWithInlineData::traceWrappers(visitor);

[haraken, 2016/05/12 16:02:54]

I don't think we need to trace this. EventTargetWithInlineData::traceWrappers
needs to be traced only if the object inherits from Node. Non-Node objects won't
need to call the traceWrappers().

See
https://code.google.com/p/chromium/codesearch#chromium/src/third_party/WebKit...

The same comment for other EventTargetWithInlineData::traceWrappers in this CL.

[Marcel Hlopko, 2016/05/12 16:15:51]

You are correct. Removing. There really isn't that much to trace :)

+}
 } // namespace blink