Global cycle detection analysis.

tools/clang/blink_gc_plugin/tests/cycle_ptrs.cpp

Index: tools/clang/blink_gc_plugin/tests/cycle_ptrs.cpp
diff --git a/tools/clang/blink_gc_plugin/tests/pure_virtual_trace.cpp b/tools/clang/blink_gc_plugin/tests/cycle_ptrs.cpp
similarity index 64%
copy from tools/clang/blink_gc_plugin/tests/pure_virtual_trace.cpp
copy to tools/clang/blink_gc_plugin/tests/cycle_ptrs.cpp
index 0f7cb99f4772d0fb6585e032821da842595d5b0a..8fe7b955f3154aea864b2c3c1295374338554393 100644
--- a/tools/clang/blink_gc_plugin/tests/pure_virtual_trace.cpp
+++ b/tools/clang/blink_gc_plugin/tests/cycle_ptrs.cpp
@@ -2,13 +2,16 @@
 // 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_ptrs.h"
 
 namespace WebCore {
 
-void C::trace(Visitor* visitor) {
+void A::trace(Visitor* visitor) {
+    visitor->trace(m_b);
+}
+
+void B::trace(Visitor* visitor) {
     visitor->trace(m_a);
-    // Is not required to trace base classes B and A.
 }
 
 }