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diff --git a/webrtc/modules/audio_processing/optionally_built_submodule_creators.h b/webrtc/modules/audio_processing/optionally_built_submodule_creators.h
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+/*
+ *  Copyright (c) 2020 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 MODULES_AUDIO_PROCESSING_OPTIONALLY_BUILT_SUBMODULE_CREATORS_H_
+#define MODULES_AUDIO_PROCESSING_OPTIONALLY_BUILT_SUBMODULE_CREATORS_H_
+
+#include <memory>
+
+#include "modules/audio_processing/transient/transient_suppressor.h"
+
+namespace webrtc {
+
+// These overrides are only to be used for testing purposes.
+// Each flag emulates a preprocessor macro to exclude a submodule of APM from
+// the build, e.g. WEBRTC_EXCLUDE_TRANSIENT_SUPPRESSOR. If the corresponding
+// flag |transient_suppression| is enabled, then the creators will return
+// nullptr instead of a submodule instance, as if the macro had been defined.
+struct ApmSubmoduleCreationOverrides {
+  bool transient_suppression = false;
+};
+
+// Creates a transient suppressor.
+// Will instead return nullptr if one of the following is true:
+// * WEBRTC_EXCLUDE_TRANSIENT_SUPPRESSOR is defined
+// * The corresponding override in |overrides| is enabled.
+std::unique_ptr<TransientSuppressor> CreateTransientSuppressor(
+    const ApmSubmoduleCreationOverrides& overrides);
+
+}  // namespace webrtc
+
+#endif  // MODULES_AUDIO_PROCESSING_OPTIONALLY_BUILT_SUBMODULE_CREATORS_H_