Adding testing config for the CrOSSystemAECDeactivatedGroups feature

Bug: chromium:1016306
Change-Id: Ibbd26fec8a3657a85aa6cf2bca0d6680e1963674
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1872219Reviewed-by: Jesse Doherty <jwd@chromium.org>
Commit-Queue: Per Åhgren <peah@chromium.org>
Cr-Commit-Position: refs/heads/master@{#708344}

testing/variations/fieldtrial_testing_config.json

@@ -1839,6 +1839,24 @@
             ]
         }
     ],
+    "CrOSSystemAECDeactivatedGroups": [
+        {
+            "platforms": [
+                "chromeos"
+            ],
+            "experiments": [
+                {
+                    "name": "AecGroupIdsWithBrowserFallbackFromCrAS",
+                    "params": {
+                        "3": "true"
+                    },
+                    "enable_features": [
+                        "CrOSSystemAECDeactivatedGroups"
+                    ]
+                }
+            ]
+        }
+    ],
     "D3D11VideoDecoder": [
         {
             "platforms": [