Blink GC plugin: improve handling of type dependent bases.

tools/clang/blink_gc_plugin/tests/templated_class_with_local_class_requires_trace.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 "templated_class_with_local_class_requires_trace.h"
+
+namespace blink {
+
+template<typename T>
+void TemplatedObject<T>::trace(Visitor* visitor)
+{
+    visitor->trace(m_local);
+    visitor->trace(m_memberRef);
+}
+
+class Test {
+public:
+    static void test()
+    {
+        HeapObject* obj = new HeapObject();
+        TemplatedObject<HeapObject>* instance =
+            new TemplatedObject<HeapObject>(obj);
+    }
+};
+
+} // namespace blink