diff --git a/api/BUILD.gn b/api/BUILD.gn
index 70caec62f8..5f048fcdb6 100644
--- a/api/BUILD.gn
+++ b/api/BUILD.gn
@@ -876,6 +876,16 @@ if (rtc_include_tests) {
     ]
   }
 
+  rtc_source_set("mock_transformable_video_frame") {
+    testonly = true
+    sources = [ "test/mock_transformable_video_frame.h" ]
+
+    deps = [
+      ":frame_transformer_interface",
+      "../test:test_support",
+    ]
+  }
+
   rtc_source_set("mock_video_bitrate_allocator") {
     testonly = true
     sources = [ "test/mock_video_bitrate_allocator.h" ]
@@ -1042,6 +1052,7 @@ if (rtc_include_tests) {
       ":mock_frame_encryptor",
       ":mock_peerconnectioninterface",
       ":mock_rtp",
+      ":mock_transformable_video_frame",
       ":mock_video_bitrate_allocator",
       ":mock_video_bitrate_allocator_factory",
       ":mock_video_codec_factory",
diff --git a/api/test/compile_all_headers.cc b/api/test/compile_all_headers.cc
index 47c5c6ec84..d9cc82cbb0 100644
--- a/api/test/compile_all_headers.cc
+++ b/api/test/compile_all_headers.cc
@@ -37,6 +37,7 @@
 #include "api/test/mock_peerconnectioninterface.h"
 #include "api/test/mock_rtpreceiver.h"
 #include "api/test/mock_rtpsender.h"
+#include "api/test/mock_transformable_video_frame.h"
 #include "api/test/mock_video_bitrate_allocator.h"
 #include "api/test/mock_video_bitrate_allocator_factory.h"
 #include "api/test/mock_video_decoder.h"
diff --git a/api/test/mock_transformable_video_frame.h b/api/test/mock_transformable_video_frame.h
new file mode 100644
index 0000000000..36798b5d73
--- /dev/null
+++ b/api/test/mock_transformable_video_frame.h
@@ -0,0 +1,38 @@
+/*
+ *  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 API_TEST_MOCK_TRANSFORMABLE_VIDEO_FRAME_H_
+#define API_TEST_MOCK_TRANSFORMABLE_VIDEO_FRAME_H_
+
+#include <vector>
+
+#include "api/frame_transformer_interface.h"
+#include "test/gmock.h"
+
+namespace webrtc {
+
+class MockTransformableVideoFrame
+    : public webrtc::TransformableVideoFrameInterface {
+ public:
+  MOCK_METHOD(rtc::ArrayView<const uint8_t>, GetData, (), (const override));
+  MOCK_METHOD(void, SetData, (rtc::ArrayView<const uint8_t> data), (override));
+  MOCK_METHOD(uint32_t, GetTimestamp, (), (const override));
+  MOCK_METHOD(uint32_t, GetSsrc, (), (const, override));
+  MOCK_METHOD(bool, IsKeyFrame, (), (const, override));
+  MOCK_METHOD(std::vector<uint8_t>, GetAdditionalData, (), (const, override));
+  MOCK_METHOD(const webrtc::VideoFrameMetadata&,
+              GetMetadata,
+              (),
+              (const, override));
+};
+
+}  // namespace webrtc
+
+#endif  // API_TEST_MOCK_TRANSFORMABLE_VIDEO_FRAME_H_