Blink GC plugin: Check polymorphic requirements on all GC-derived classes.

tools/clang/blink_gc_plugin/tests/polymorphic_class_with_non_virtual_trace.h

Index: tools/clang/blink_gc_plugin/tests/polymorphic_class_with_non_virtual_trace.h
diff --git a/tools/clang/blink_gc_plugin/tests/polymorphic_class_with_non_virtual_trace.h b/tools/clang/blink_gc_plugin/tests/polymorphic_class_with_non_virtual_trace.h
index 3396c94553f5219cb6073bd9b81ad2da03f30f01..f5d999ebf6430a7eddc20c549c268f6c36b5143d 100644
--- a/tools/clang/blink_gc_plugin/tests/polymorphic_class_with_non_virtual_trace.h
+++ b/tools/clang/blink_gc_plugin/tests/polymorphic_class_with_non_virtual_trace.h
@@ -41,6 +41,21 @@ private:
     Member<HeapObject> m_obj;
 };
 
+template<typename T>
+class TemplatedNonPolymorphicBase
+    : public GarbageCollected<TemplatedNonPolymorphicBase<T> > {
+public:
+    void trace(Visitor* visitor) { visitor->trace(m_obj); }
+private:
+    Member<HeapObject> m_obj;
+};
+
+// Looks OK, but will result in an incorrect object pointer when marking.
+class TemplatedIsNotLeftMostPolymorphic
+    : public TemplatedNonPolymorphicBase<TemplatedIsNotLeftMostPolymorphic>,
+      public PolymorphicBase {
+};
+
 }
 
 #endif