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diff --git a/third_party/libwebrtc/api/test/test_dependency_factory.h b/third_party/libwebrtc/api/test/test_dependency_factory.h
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+++ b/third_party/libwebrtc/api/test/test_dependency_factory.h
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+/*
+ *  Copyright (c) 2018 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef API_TEST_TEST_DEPENDENCY_FACTORY_H_
+#define API_TEST_TEST_DEPENDENCY_FACTORY_H_
+
+#include <memory>
+
+#include "api/test/video_quality_test_fixture.h"
+
+namespace webrtc {
+
+// Override this class if to inject custom components into WebRTC tests.
+// Not all WebRTC tests get their components from here, so you need to make
+// sure the tests you want actually use this class.
+//
+// This class is not thread safe and you need to make call calls from the same
+// (test main) thread.
+class TestDependencyFactory {
+ public:
+  virtual ~TestDependencyFactory() = default;
+
+  // The singleton MUST be stateless since tests execute in any order. It must
+  // be set before tests start executing.
+  static const TestDependencyFactory& GetInstance();
+  static void SetInstance(std::unique_ptr<TestDependencyFactory> instance);
+
+  // Returns the component a test should use. Returning nullptr means that the
+  // test is free to use whatever defaults it wants. The injection components
+  // themselves can be mutable, but we need to make new ones for every test that
+  // executes so state doesn't spread between tests.
+  virtual std::unique_ptr<VideoQualityTestFixtureInterface::InjectionComponents>
+  CreateComponents() const;
+
+ private:
+  static std::unique_ptr<TestDependencyFactory> instance_;
+};
+
+}  // namespace webrtc
+
+#endif  // API_TEST_TEST_DEPENDENCY_FACTORY_H_