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diff --git a/third_party/libwebrtc/api/test/fake_frame_encryptor.h b/third_party/libwebrtc/api/test/fake_frame_encryptor.h
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+/*
+ *  Copyright 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_FAKE_FRAME_ENCRYPTOR_H_
+#define API_TEST_FAKE_FRAME_ENCRYPTOR_H_
+
+#include <stddef.h>
+#include <stdint.h>
+
+#include "api/array_view.h"
+#include "api/crypto/frame_encryptor_interface.h"
+#include "api/media_types.h"
+#include "rtc_base/ref_counted_object.h"
+
+namespace webrtc {
+
+// The FakeFrameEncryptor is a TEST ONLY fake implementation of the
+// FrameEncryptorInterface. It is constructed with a simple single digit key and
+// a fixed postfix byte. This is just to validate that the core code works
+// as expected.
+class FakeFrameEncryptor
+    : public rtc::RefCountedObject<FrameEncryptorInterface> {
+ public:
+  // Provide a key (0,255) and some postfix byte (0,255).
+  explicit FakeFrameEncryptor(uint8_t fake_key = 0xAA,
+                              uint8_t postfix_byte = 255);
+  // Simply xors each payload with the provided fake key and adds the postfix
+  // bit to the end. This will always fail if fail_encryption_ is set to true.
+  int Encrypt(cricket::MediaType media_type,
+              uint32_t ssrc,
+              rtc::ArrayView<const uint8_t> additional_data,
+              rtc::ArrayView<const uint8_t> frame,
+              rtc::ArrayView<uint8_t> encrypted_frame,
+              size_t* bytes_written) override;
+  // Always returns 1 more than the size of the frame.
+  size_t GetMaxCiphertextByteSize(cricket::MediaType media_type,
+                                  size_t frame_size) override;
+  // Sets the fake key to use during encryption.
+  void SetFakeKey(uint8_t fake_key);
+  // Returns the fake key used during encryption.
+  uint8_t GetFakeKey() const;
+  // Set the postfix byte to use.
+  void SetPostfixByte(uint8_t expected_postfix_byte);
+  // Return a postfix byte added to each outgoing payload.
+  uint8_t GetPostfixByte() const;
+  // Force all encryptions to fail.
+  void SetFailEncryption(bool fail_encryption);
+
+  enum class FakeEncryptionStatus : int {
+    OK = 0,
+    FORCED_FAILURE = 1,
+  };
+
+ private:
+  uint8_t fake_key_ = 0;
+  uint8_t postfix_byte_ = 0;
+  bool fail_encryption_ = false;
+};
+
+}  // namespace webrtc
+
+#endif  // API_TEST_FAKE_FRAME_ENCRYPTOR_H_