Update from https://crrev.com/317530

tools/clang/blink_gc_plugin/tests/traceimpl_error.cpp

Index: tools/clang/blink_gc_plugin/tests/traceimpl_error.cpp
diff --git a/tools/clang/blink_gc_plugin/tests/traceimpl_error.cpp b/tools/clang/blink_gc_plugin/tests/traceimpl_error.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..041c565e54d45f6651d4c536d09b88f3cfef50f1
--- /dev/null
+++ b/tools/clang/blink_gc_plugin/tests/traceimpl_error.cpp
@@ -0,0 +1,29 @@
+// Copyright 2015 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 "traceimpl_error.h"
+
+namespace blink {
+
+void TraceImplExternWithUntracedMember::trace(Visitor* visitor) {
+  traceImpl(visitor);
+}
+
+template <typename VisitorDispatcher>
+inline void TraceImplExternWithUntracedMember::traceImpl(
+    VisitorDispatcher visitor) {
+  // Should get a warning as well.
+}
+
+void TraceImplExternWithUntracedBase::trace(Visitor* visitor) {
+  traceImpl(visitor);
+}
+
+template <typename VisitorDispatcher>
+inline void TraceImplExternWithUntracedBase::traceImpl(
+    VisitorDispatcher visitor) {
+  // Ditto.
+}
+
+}