Added an "enable-audio-processor" flag and WebRtcAudioProcessor class

content/renderer/media/webrtc_audio_processor_util.h

+// Copyright 2013 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_WEBRTC_AUDIO_PROCESSOR_UTIL_H_
+#define CONTENT_RENDERER_MEDIA_WEBRTC_AUDIO_PROCESSOR_UTIL_H_
+
+#include <string>
+
+namespace webrtc {
+
+class AudioFrame;
+class AudioProcessing;
+class MediaConstraintsInterface;
+
+}
+
+namespace content {
+
+using webrtc::AudioProcessing;
+using webrtc::MediaConstraintsInterface;
+
+bool GetPropertyFromConstraints(
+    const MediaConstraintsInterface* constraints,
+    const std::string& key);
+
+void EnableEchoCancellation(AudioProcessing* audio_processing);
+
+void EnableNoiseSuppression(AudioProcessing* audio_processing);
+
+void EnableHighPassFilter(AudioProcessing* audio_processing);
+
+void EnableTypingDetection(AudioProcessing* audio_processing);
+
+void EnableExperimentalEchoCancellation(AudioProcessing* audio_processing);
+
+void StartAecDump(AudioProcessing* audio_processin);
+
+void StopAecDump(AudioProcessing* audio_processin);
+
+}  // namespace content
+
+#endif  // CONTENT_RENDERER_MEDIA_WEBRTC_AUDIO_PROCESSOR_UTIL_H_