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diff --git a/third_party/libwebrtc/video/adaptation/pixel_limit_resource.h b/third_party/libwebrtc/video/adaptation/pixel_limit_resource.h
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+++ b/third_party/libwebrtc/video/adaptation/pixel_limit_resource.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 VIDEO_ADAPTATION_PIXEL_LIMIT_RESOURCE_H_
+#define VIDEO_ADAPTATION_PIXEL_LIMIT_RESOURCE_H_
+
+#include <string>
+
+#include "absl/types/optional.h"
+#include "api/adaptation/resource.h"
+#include "api/scoped_refptr.h"
+#include "call/adaptation/video_stream_input_state_provider.h"
+#include "rtc_base/task_utils/repeating_task.h"
+#include "rtc_base/thread_annotations.h"
+
+namespace webrtc {
+
+// An adaptation resource designed to be used in the TestBed. Used to simulate
+// being CPU limited.
+//
+// Periodically reports "overuse" or "underuse" (every 5 seconds) until the
+// stream is within the bounds specified in terms of a maximum resolution and
+// one resolution step lower than that (this avoids toggling when this is the
+// only resource in play). When multiple resources come in to play some amount
+// of toggling is still possible in edge cases but that is OK for testing
+// purposes.
+class PixelLimitResource : public Resource {
+ public:
+  static rtc::scoped_refptr<PixelLimitResource> Create(
+      TaskQueueBase* task_queue,
+      VideoStreamInputStateProvider* input_state_provider);
+
+  PixelLimitResource(TaskQueueBase* task_queue,
+                     VideoStreamInputStateProvider* input_state_provider);
+  ~PixelLimitResource() override;
+
+  void SetMaxPixels(int max_pixels);
+
+  // Resource implementation.
+  std::string Name() const override { return "PixelLimitResource"; }
+  void SetResourceListener(ResourceListener* listener) override;
+
+ private:
+  TaskQueueBase* const task_queue_;
+  VideoStreamInputStateProvider* const input_state_provider_;
+  absl::optional<int> max_pixels_ RTC_GUARDED_BY(task_queue_);
+  webrtc::ResourceListener* listener_ RTC_GUARDED_BY(task_queue_);
+  RepeatingTaskHandle repeating_task_ RTC_GUARDED_BY(task_queue_);
+};
+
+}  // namespace webrtc
+
+#endif  // VIDEO_ADAPTATION_PIXEL_LIMIT_RESOURCE_H_