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

Bug: chromium:949156
Change-Id: I55cb3a3680d3c0fc4c3ae92df0d4de4494ad3856
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2584005Reviewed-by: Olga Sharonova <olka@chromium.org>
Commit-Queue: Jakob Ivarsson <jakobi@google.com>
Cr-Commit-Position: refs/heads/master@{#835667}

testing/variations/fieldtrial_testing_config.json

@@ -8084,6 +8084,25 @@
             ]
         }
     ],
+    "WebRTC-Audio-NetEqDelayManagerConfig": [
+        {
+            "platforms": [
+                "windows",
+                "mac",
+                "chromeos",
+                "linux",
+                "ios",
+                "android",
+                "android_weblayer",
+                "android_webview"
+            ],
+            "experiments": [
+                {
+                    "name": "quantile:0.95,forget_factor:0.983,resample_interval_ms:500"
+                }
+            ]
+        }
+    ],
     "WebRTC-Audio-SendSideBwe": [
         {
             "platforms": [