Create a private API for controlling WebRTC's AEC3

content/renderer/media/aec_dump_message_filter.h

Index: content/renderer/media/aec_dump_message_filter.h
diff --git a/content/renderer/media/aec_dump_message_filter.h b/content/renderer/media/aec_dump_message_filter.h
index 9cfaf4f1af5887254255a8e255744cbdbfa8ecbd..12cbf6f72d290648fd3d7254a38c8bbe498cacf5 100644
--- a/content/renderer/media/aec_dump_message_filter.h
+++ b/content/renderer/media/aec_dump_message_filter.h
@@ -28,6 +28,7 @@ class CONTENT_EXPORT AecDumpMessageFilter : public IPC::MessageFilter {
     virtual void OnAecDumpFile(
         const IPC::PlatformFileForTransit& file_handle) = 0;
     virtual void OnDisableAecDump() = 0;
+    virtual void OnAec3Enable(bool enable) = 0;
     virtual void OnIpcClosing() = 0;
   };
 
@@ -73,12 +74,14 @@ class CONTENT_EXPORT AecDumpMessageFilter : public IPC::MessageFilter {
   // Accessed on |io_task_runner_|.
   void OnEnableAecDump(int id, IPC::PlatformFileForTransit file_handle);
   void OnDisableAecDump();
+  void OnEnableAec3(int id, bool enable);
 
   // Accessed on |main_task_runner_|.
   void DoEnableAecDump(int id, IPC::PlatformFileForTransit file_handle);
   void DoDisableAecDump();
   void DoChannelClosingOnDelegates();
   int GetIdForDelegate(AecDumpMessageFilter::AecDumpDelegate* delegate);
+  void DoEnableAec3(int id, bool enable);
 
   // Accessed on |io_task_runner_|.
   IPC::Sender* sender_;