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diff --git a/call/adaptation/adaptation_listener.h b/call/adaptation/adaptation_listener.h
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+/*
+ *  Copyright 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 CALL_ADAPTATION_ADAPTATION_LISTENER_H_
+#define CALL_ADAPTATION_ADAPTATION_LISTENER_H_
+
+#include "api/scoped_refptr.h"
+#include "call/adaptation/resource.h"
+#include "call/adaptation/video_source_restrictions.h"
+#include "call/adaptation/video_stream_input_state.h"
+
+namespace webrtc {
+
+// TODO(hbos): Can this be consolidated with
+// ResourceAdaptationProcessorListener::OnVideoSourceRestrictionsUpdated()? Both
+// listen to adaptations being applied, but on different layers with different
+// arguments.
+class AdaptationListener {
+ public:
+  virtual ~AdaptationListener();
+
+  // TODO(https://crbug.com/webrtc/11172): When we have multi-stream adaptation
+  // support, this interface needs to indicate which stream the adaptation
+  // applies to.
+  virtual void OnAdaptationApplied(
+      const VideoStreamInputState& input_state,
+      const VideoSourceRestrictions& restrictions_before,
+      const VideoSourceRestrictions& restrictions_after,
+      rtc::scoped_refptr<Resource> reason_resource) = 0;
+};
+
+}  // namespace webrtc
+
+#endif  // CALL_ADAPTATION_ADAPTATION_LISTENER_H_