diff -r 000000000000 -r 6474c204b198 media/webrtc/trunk/tools/clang/plugins/tests/virtual_methods.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/media/webrtc/trunk/tools/clang/plugins/tests/virtual_methods.cpp	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,36 @@
+// Copyright (c) 2012 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 "virtual_methods.h"
+
+// Shouldn't warn about method usage in the implementation file.
+class VirtualMethodsInImplementation {
+ public:
+  virtual void MethodIsAbstract() = 0;
+  virtual void MethodHasNoArguments();
+  virtual void MethodHasEmptyDefaultImpl() {}
+  virtual bool ComplainAboutThis() { return true; }
+};
+
+// Stubs to fill in the abstract method
+class ConcreteVirtualMethodsInHeaders : public VirtualMethodsInHeaders {
+ public:
+  virtual void MethodIsAbstract() override {}
+};
+
+class ConcreteVirtualMethodsInImplementation
+    : public VirtualMethodsInImplementation {
+ public:
+  virtual void MethodIsAbstract() override {}
+};
+
+// Fill in the implementations
+void VirtualMethodsInHeaders::MethodHasNoArguments() {}
+void WarnOnMissingVirtual::MethodHasNoArguments() {}
+void VirtualMethodsInImplementation::MethodHasNoArguments() {}
+
+int main() {
+  ConcreteVirtualMethodsInHeaders one;
+  ConcreteVirtualMethodsInImplementation two;
+}