Create a private API for controlling WebRTC's AEC3

content/renderer/media/mock_constraint_factory.h

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_RENDERER_MEDIA_MOCK_CONSTRAINT_FACTORY_H_
 #define CONTENT_RENDERER_MEDIA_MOCK_CONSTRAINT_FACTORY_H_
 
 #include <string>
 #include <vector>
 
 #include "base/macros.h"
 #include "third_party/WebKit/public/platform/WebMediaConstraints.h"
 
 namespace content {
 
 class MockConstraintFactory {
  public:
   MockConstraintFactory();
   ~MockConstraintFactory();
 
   blink::WebMediaConstraints CreateWebMediaConstraints() const;
   blink::WebMediaTrackConstraintSet& basic() { return basic_; }
   blink::WebMediaTrackConstraintSet& AddAdvanced();
 
   void DisableDefaultAudioConstraints();
+  void DisableAecAudioConstraints();
   void Reset();
 
  private:
   blink::WebMediaTrackConstraintSet basic_;
   std::vector<blink::WebMediaTrackConstraintSet> advanced_;
 
   DISALLOW_COPY_AND_ASSIGN(MockConstraintFactory);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_MEDIA_MOCK_CONSTRAINT_FACTORY_H_