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

chrome/browser/chromeos/login/chrome_restart_request.cc

Index: chrome/browser/chromeos/login/chrome_restart_request.cc
diff --git a/chrome/browser/chromeos/login/chrome_restart_request.cc b/chrome/browser/chromeos/login/chrome_restart_request.cc
index 27427658aee55701931f6f1d38c688c22cec6ec0..2f3258d606ddd640bc2ba1b24fff1f3fc57828c7 100644
--- a/chrome/browser/chromeos/login/chrome_restart_request.cc
+++ b/chrome/browser/chromeos/login/chrome_restart_request.cc
@@ -48,7 +48,7 @@ namespace chromeos {
 
 namespace {
 
-// Increase logging level for Guest mode to avoid LOG(INFO) messages in logs.
+// Increase logging level for Guest mode to avoid INFO messages in logs.
 const char kGuestModeLoggingLevel[] = "1";
 
 // Format of command line switch.
@@ -147,6 +147,7 @@ std::string DeriveCommandLine(const GURL& start_url,
 #if defined(ENABLE_WEBRTC)
       ::switches::kDisableWebRtcHWDecoding,
       ::switches::kDisableWebRtcHWEncoding,
+      ::switches::kEnableAudioTrackProcessing,
       ::switches::kEnableWebRtcHWVp8Encoding,
 #endif
       ash::switches::kAshDefaultWallpaperLarge,