Blink GC plugin: require that trace call base::trace and traceAfterDispatch call base::traceAfterDi…

tools/clang/blink_gc_plugin/tests/trace_after_dispatch.cpp

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "trace_after_dispatch.h"
 
 namespace WebCore {
 
 static B* toB(A* a) { return static_cast<B*>(a); }
 
@@ skipping 12 matching lines @@
     }
 }
 
 void A::traceAfterDispatch(Visitor* visitor)
 {
 }
 
 void B::traceAfterDispatch(Visitor* visitor)
 {
     visitor->trace(m_a);
-    // Missing A::trace(visitor);
+    // Missing A::traceAfterDispatch(visitor);
+    // Also check that calling trace does not count.
+    A::trace(visitor);
 }
 
 void C::traceAfterDispatch(Visitor* visitor)
 {
     // Missing visitor->trace(m_a);
-    A::trace(visitor);
+    A::traceAfterDispatch(visitor);
 }
 
 void D::traceAfterDispatch(Visitor* visitor)
 {
     visitor->trace(m_a);
-    Abstract::trace(visitor);
+    Abstract::traceAfterDispatch(visitor);
 }
 
 }