Add aec-refined-adaptive-filter command line switch

content/public/common/content_switches.cc

Index: content/public/common/content_switches.cc
diff --git a/content/public/common/content_switches.cc b/content/public/common/content_switches.cc
index feb6494fd5a6cc6ee12415c17f05c1fcdbcb5597..a9a6101c4accff093b4e749fb91f02c86b3fb48d 100644
--- a/content/public/common/content_switches.cc
+++ b/content/public/common/content_switches.cc
@@ -11,6 +11,14 @@ namespace switches {
 // have an effect. 0 disables MSAA.
 const char kAcceleratedCanvas2dMSAASampleCount[] = "canvas-msaa-sample-count";
 
+// Enables a new tuning of the WebRTC Acoustic Echo Canceler (AEC). The new
+// tuning aims at resolving two issues with the AEC:
+// https://bugs.chromium.org/p/webrtc/issues/detail?id=5777
+// https://bugs.chromium.org/p/webrtc/issues/detail?id=5778
+// TODO(hlundin): Remove this switch when experimentation is over;
+// crbug.com/603821.
+const char kAecRefinedAdaptiveFilter[] = "aec-refined-adaptive-filter";
+
 // Override the default minimum starting volume of the Automatic Gain Control
 // algorithm in WebRTC used with audio tracks from getUserMedia.
 // The valid range is 12-255. Values outside that range will be clamped