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

content/renderer/media/media_stream_audio_processor_options.h

Index: content/renderer/media/media_stream_audio_processor_options.h
diff --git a/content/renderer/media/media_stream_audio_processor_options.h b/content/renderer/media/media_stream_audio_processor_options.h
new file mode 100644
index 0000000000000000000000000000000000000000..dcdec4e61f4de17d65154cde600588db1164aa78
--- /dev/null
+++ b/content/renderer/media/media_stream_audio_processor_options.h
@@ -0,0 +1,53 @@
+// 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_MEDIA_STREAM_AUDIO_PROCESSOR_OPTIONS_H_
+#define CONTENT_RENDERER_MEDIA_MEDIA_STREAM_AUDIO_PROCESSOR_OPTIONS_H_
+
+#include <string>
+
+namespace webrtc {
+
+class AudioFrame;
+class AudioProcessing;
+class MediaConstraintsInterface;
+
+}
+
+namespace content {
+
+using webrtc::AudioProcessing;
+using webrtc::MediaConstraintsInterface;
+
+// Gets the property named by |key| from the |constraints|.
+// Returns true if the key is found and has a valid boolean value; Otherwise
+// false.
+bool GetPropertyFromConstraints(
+    const MediaConstraintsInterface* constraints,
+    const std::string& key);
+
+// Enables the echo cancellation in |audio_processing|.
+void EnableEchoCancellation(AudioProcessing* audio_processing);
+
+// Enables the noise suppression in |audio_processing|.
+void EnableNoiseSuppression(AudioProcessing* audio_processing);
+
+// Enables the high pass filter in |audio_processing|.
+void EnableHighPassFilter(AudioProcessing* audio_processing);
+
+// Enables the typing detection in |audio_processing|.
+void EnableTypingDetection(AudioProcessing* audio_processing);
+
+// Enables the experimental echo cancellation in |audio_processing|.
+void EnableExperimentalEchoCancellation(AudioProcessing* audio_processing);
+
+// Starts the echo cancellation dump in |audio_processing|.
+void StartAecDump(AudioProcessing* audio_processing);
+
+// Stops the echo cancellation dump in |audio_processing|.
+void StopAecDump(AudioProcessing* audio_processing);
+
+}  // namespace content
+
+#endif  // CONTENT_RENDERER_MEDIA_MEDIA_STREAM_AUDIO_PROCESSOR_OPTIONS_H_