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diff --git a/third_party/libwebrtc/webrtc/test/field_trial.h b/third_party/libwebrtc/webrtc/test/field_trial.h
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+/*
+ *  Copyright (c) 2014 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 TEST_FIELD_TRIAL_H_
+#define TEST_FIELD_TRIAL_H_
+
+#include <string>
+#include <map>
+
+namespace webrtc {
+namespace test {
+
+// Parses enabled field trials from a string config, such as the one passed
+// to chrome's argument --force-fieldtrials and initializes webrtc::field_trial
+// with such a config.
+//  E.g.:
+//    "WebRTC-experimentFoo/Enabled/WebRTC-experimentBar/Enabled100kbps/"
+//    Assigns the process to group "Enabled" on WebRTCExperimentFoo trial
+//    and to group "Enabled100kbps" on WebRTCExperimentBar.
+//
+//  E.g. invalid config:
+//    "WebRTC-experiment1/Enabled"  (note missing / separator at the end).
+//
+// Note: This method crashes with an error message if an invalid config is
+// passed to it. That can be used to find out if a binary is parsing the flags.
+void InitFieldTrialsFromString(const std::string& config);
+
+// This class is used to override field-trial configs within specific tests.
+// After this class goes out of scope previous field trials will be restored.
+class ScopedFieldTrials {
+ public:
+  explicit ScopedFieldTrials(const std::string& config);
+  ~ScopedFieldTrials();
+ private:
+  std::string current_field_trials_;
+  const char* previous_field_trials_;
+};
+
+}  // namespace test
+}  // namespace webrtc
+
+#endif  // TEST_FIELD_TRIAL_H_