Global cycle detection analysis.

tools/clang/blink_gc_plugin/tests/cycle_super.cpp

Index: tools/clang/blink_gc_plugin/tests/cycle_super.cpp
diff --git a/tools/clang/blink_gc_plugin/tests/pure_virtual_trace.cpp b/tools/clang/blink_gc_plugin/tests/cycle_super.cpp
similarity index 57%
copy from tools/clang/blink_gc_plugin/tests/pure_virtual_trace.cpp
copy to tools/clang/blink_gc_plugin/tests/cycle_super.cpp
index 0f7cb99f4772d0fb6585e032821da842595d5b0a..41359ed04c4188351c05b2c7d11da8857f420398 100644
--- a/tools/clang/blink_gc_plugin/tests/pure_virtual_trace.cpp
+++ b/tools/clang/blink_gc_plugin/tests/cycle_super.cpp
@@ -2,13 +2,20 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "pure_virtual_trace.h"
+#include "cycle_super.h"
 
 namespace WebCore {
 
+void A::trace(Visitor* visitor) {
+    visitor->trace(m_d);
+}
+
+void B::trace(Visitor* visitor) {
+    A::trace(visitor);
+}
+
 void C::trace(Visitor* visitor) {
-    visitor->trace(m_a);
-    // Is not required to trace base classes B and A.
+    B::trace(visitor);
 }
 
 }