Add field trial testing config for WebRTC-Audio-NetEqDecisionLogicSettings.

Bug: chromium:993325
Change-Id: I5e6c8cf1da24e1bb77981f9c0073b57ad2a56352
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1781424Reviewed-by: Brian White <bcwhite@chromium.org>
Commit-Queue: Jakob Ivarsson <jakobi@google.com>
Cr-Commit-Position: refs/heads/master@{#693170}

testing/variations/fieldtrial_testing_config.json

@@ -6694,6 +6694,21 @@
             ]
         }
     ],
+    "WebRTC-Audio-NetEqDecisionLogicSettings": [
+        {
+            "platforms": [
+                "windows",
+                "mac",
+                "chromeos",
+                "linux"
+            ],
+            "experiments": [
+                {
+                    "name": "estimate_dtx_delay:true,time_stretch_cn:true"
+                }
+            ]
+        }
+    ],
     "WebRTC-Audio-NetEqDelayHistogram": [
         {
             "platforms": [