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diff --git a/third_party/libwebrtc/webrtc/api/test/fakeconstraints.h b/third_party/libwebrtc/webrtc/api/test/fakeconstraints.h
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+++ b/third_party/libwebrtc/webrtc/api/test/fakeconstraints.h
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+/*
+ *  Copyright 2012 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_FAKECONSTRAINTS_H_
+#define API_TEST_FAKECONSTRAINTS_H_
+
+#include <string>
+#include <vector>
+
+#include "api/mediaconstraintsinterface.h"
+#include "rtc_base/stringencode.h"
+
+namespace webrtc {
+
+class FakeConstraints : public webrtc::MediaConstraintsInterface {
+ public:
+  FakeConstraints() { }
+  virtual ~FakeConstraints() { }
+
+  virtual const Constraints& GetMandatory() const {
+    return mandatory_;
+  }
+
+  virtual const Constraints& GetOptional() const {
+    return optional_;
+  }
+
+  template <class T>
+  void AddMandatory(const std::string& key, const T& value) {
+    mandatory_.push_back(Constraint(key, rtc::ToString<T>(value)));
+  }
+
+  template <class T>
+  void SetMandatory(const std::string& key, const T& value) {
+    std::string value_str;
+    if (mandatory_.FindFirst(key, &value_str)) {
+      for (Constraints::iterator iter = mandatory_.begin();
+           iter != mandatory_.end(); ++iter) {
+        if (iter->key == key) {
+          mandatory_.erase(iter);
+          break;
+        }
+      }
+    }
+    mandatory_.push_back(Constraint(key, rtc::ToString<T>(value)));
+  }
+
+  template <class T>
+  void AddOptional(const std::string& key, const T& value) {
+    optional_.push_back(Constraint(key, rtc::ToString<T>(value)));
+  }
+
+  void SetMandatoryMinAspectRatio(double ratio) {
+    SetMandatory(MediaConstraintsInterface::kMinAspectRatio, ratio);
+  }
+
+  void SetMandatoryMinWidth(int width) {
+    SetMandatory(MediaConstraintsInterface::kMinWidth, width);
+  }
+
+  void SetMandatoryMinHeight(int height) {
+    SetMandatory(MediaConstraintsInterface::kMinHeight, height);
+  }
+
+  void SetOptionalMaxWidth(int width) {
+    AddOptional(MediaConstraintsInterface::kMaxWidth, width);
+  }
+
+  void SetMandatoryMaxFrameRate(int frame_rate) {
+    SetMandatory(MediaConstraintsInterface::kMaxFrameRate, frame_rate);
+  }
+
+  void SetMandatoryReceiveAudio(bool enable) {
+    SetMandatory(MediaConstraintsInterface::kOfferToReceiveAudio, enable);
+  }
+
+  void SetMandatoryReceiveVideo(bool enable) {
+    SetMandatory(MediaConstraintsInterface::kOfferToReceiveVideo, enable);
+  }
+
+  void SetMandatoryUseRtpMux(bool enable) {
+    SetMandatory(MediaConstraintsInterface::kUseRtpMux, enable);
+  }
+
+  void SetMandatoryIceRestart(bool enable) {
+    SetMandatory(MediaConstraintsInterface::kIceRestart, enable);
+  }
+
+  void SetAllowRtpDataChannels() {
+    SetMandatory(MediaConstraintsInterface::kEnableRtpDataChannels, true);
+    SetMandatory(MediaConstraintsInterface::kEnableDtlsSrtp, false);
+  }
+
+  void SetOptionalVAD(bool enable) {
+    AddOptional(MediaConstraintsInterface::kVoiceActivityDetection, enable);
+  }
+
+  void SetAllowDtlsSctpDataChannels() {
+    SetMandatory(MediaConstraintsInterface::kEnableDtlsSrtp, true);
+  }
+
+ private:
+  Constraints mandatory_;
+  Constraints optional_;
+};
+
+}  // namespace webrtc
+
+#endif  // API_TEST_FAKECONSTRAINTS_H_