Create a private API for controlling WebRTC's AEC3

chrome/browser/extensions/api/webrtc_audio_private/webrtc_audio_private_api.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 CHROME_BROWSER_EXTENSIONS_API_WEBRTC_AUDIO_PRIVATE_WEBRTC_AUDIO_PRIVATE_API_H_
 #define CHROME_BROWSER_EXTENSIONS_API_WEBRTC_AUDIO_PRIVATE_WEBRTC_AUDIO_PRIVATE_API_H_
 
 #include <stddef.h>
 
 #include <string>
@@ skipping 83 matching lines @@
   std::string CalculateHMACImpl(const std::string& raw_id);
 
   // Initializes |device_id_salt_|. Must be called on the UI thread,
   // before any calls to |device_id_salt()|.
   void InitDeviceIDSalt();
 
   // Callable from any thread. Must previously have called
   // |InitDeviceIDSalt()|.
   std::string device_id_salt() const;
 
+  // Returns the RenderProcessHost associated with the given |request|
+  // authorized by the |security_origin|. Returns null if unauthorized or
+  // the RPH does not exist.
+  content::RenderProcessHost* RphFromRequest(
+      const api::webrtc_audio_private::RequestInfo& request,
+      const std::string& security_origin);
+
  private:
   std::string device_id_salt_;
 
   DISALLOW_COPY_AND_ASSIGN(WebrtcAudioPrivateFunction);
 };
 
 class WebrtcAudioPrivateGetSinksFunction : public WebrtcAudioPrivateFunction {
  protected:
   ~WebrtcAudioPrivateGetSinksFunction() override {}
 
@@ skipping 106 matching lines @@
   void OnHMACCalculated(const std::string& hmac) override;
 
   // Accessed from UI thread and device thread, but only on one at a
   // time, no locking needed.
   std::unique_ptr<api::webrtc_audio_private::GetAssociatedSink::Params> params_;
 
   // Audio sources (input devices). Filled in by DoWorkOnDeviceThread.
   media::AudioDeviceDescriptions source_devices_;
 };
 
+class WebrtcAudioPrivateSetAudioExperimentsFunction
+    : public WebrtcAudioPrivateFunction {
+ public:
+  WebrtcAudioPrivateSetAudioExperimentsFunction();
+
+ protected:
+  ~WebrtcAudioPrivateSetAudioExperimentsFunction() override;
+
+ private:
+  DECLARE_EXTENSION_FUNCTION("webrtcAudioPrivate.setAudioExperiments",
+                             WEBRTC_AUDIO_PRIVATE_SET_AUDIO_EXPERIMENTS);
+
+  bool RunAsync() override;
+};
+
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_API_WEBRTC_AUDIO_PRIVATE_WEBRTC_AUDIO_PRIVATE_API_H_