Update from https://crrev.com/317530

tools/clang/blink_gc_plugin/tests/traceimpl_error.h

+// 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.
+
+#ifndef TRACEIMPL_ERROR_H_
+#define TRACEIMPL_ERROR_H_
+
+#include "heap/stubs.h"
+
+namespace blink {
+
+class X : public GarbageCollected<X> {
+ public:
+  virtual void trace(Visitor*) {}
+};
+
+class TraceImplInlinedWithUntracedMember
+    : public GarbageCollected<TraceImplInlinedWithUntracedMember> {
+ public:
+  void trace(Visitor* visitor) { traceImpl(visitor); }
+
+  template <typename VisitorDispatcher>
+  void traceImpl(VisitorDispatcher visitor) {
+    // Empty; should get complaints from the plugin for untraced x_.
+  }
+
+ private:
+  Member<X> x_;
+};
+
+class TraceImplExternWithUntracedMember
+    : public GarbageCollected<TraceImplExternWithUntracedMember> {
+ public:
+  void trace(Visitor* visitor);
+
+  template <typename VisitorDispatcher>
+  inline void traceImpl(VisitorDispatcher);
+
+ private:
+  Member<X> x_;
+};
+
+class Base : public GarbageCollected<Base> {
+ public:
+  virtual void trace(Visitor*) {}
+};
+
+class TraceImplInlineWithUntracedBase : public Base {
+ public:
+  void trace(Visitor* visitor) override { traceImpl(visitor); }
+
+  template <typename VisitorDispatcher>
+  void traceImpl(VisitorDispatcher visitor) {
+    // Empty; should get complaints from the plugin for untraced Base.
+  }
+};
+
+class TraceImplExternWithUntracedBase : public Base {
+ public:
+  void trace(Visitor*) override;
+
+  template <typename VisitorDispatcher>
+  void traceImpl(VisitorDispatcher visitor);
+};
+
+}
+
+#endif  // TRACEIMPL_ERROR_H_