Adding functionality for activating for the WebRTC EchoCanceller3 functionality in Chrome.

chrome/app/generated_resources.grd

Index: chrome/app/generated_resources.grd
diff --git a/chrome/app/generated_resources.grd b/chrome/app/generated_resources.grd
index c9322e1da2e3b59e853af9d3e0bb9ba8c466793f..93970e183ededb044417483ad3038b3a32632c4d 100644
--- a/chrome/app/generated_resources.grd
+++ b/chrome/app/generated_resources.grd
@@ -5482,6 +5482,12 @@ Keep your key file in a safe place. You will need it to create new versions of y
       <message name="IDS_FLAGS_WEBRTC_STUN_ORIGIN_DESCRIPTION" desc="Description of chrome:flags option to turn on Origin header for WebRTC STUN messages">
         When enabled, Stun messages generated by WebRTC will contain the Origin header.
       </message>
+      <message name="IDS_FLAGS_WEBRTC_ECHO_CANCELLER_3_NAME" desc="Name of chrome:flags option to enable WebRTC Echo Canceller 3.">
+        WebRTC Echo Canceller 3.
+      </message>
+      <message name="IDS_FLAGS_WEBRTC_ECHO_CANCELLER_3_DESCRIPTION" desc="Description of chrome:flags option to enable WebRTC Echo Canceller 3.">
+        Experimental WebRTC echo canceller (AEC3).
+      </message>
       <if expr="is_android">
        <message name="IDS_FLAGS_MEDIA_SCREEN_CAPTURE_NAME" desc="Name of chrome:flags option to enable screen capture." translateable="false">
          Experimental ScreenCapture.