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diff --git a/third_party/libwebrtc/modules/desktop_capture/test_utils.h b/third_party/libwebrtc/modules/desktop_capture/test_utils.h
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+++ b/third_party/libwebrtc/modules/desktop_capture/test_utils.h
@@ -0,0 +1,27 @@
+/*
+ *  Copyright (c) 2016 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_DESKTOP_CAPTURE_TEST_UTILS_H_
+#define MODULES_DESKTOP_CAPTURE_TEST_UTILS_H_
+
+#include "modules/desktop_capture/desktop_frame.h"
+
+namespace webrtc {
+
+// Clears a DesktopFrame `frame` by setting its data() into 0.
+void ClearDesktopFrame(DesktopFrame* frame);
+
+// Compares size() and data() of two DesktopFrames `left` and `right`.
+bool DesktopFrameDataEquals(const DesktopFrame& left,
+                            const DesktopFrame& right);
+
+}  // namespace webrtc
+
+#endif  // MODULES_DESKTOP_CAPTURE_TEST_UTILS_H_