Add field trial experiment for Menu Shuffle experiment

Bug: 460598631
Change-Id: Iad10600dfbe90d3ddae11dd84f8dd4d4bc58b892
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/7208173
Reviewed-by: Robert Kaplow <rkaplow@chromium.org>
Commit-Queue: Andres Munoz Medina <ammedina@google.com>
Reviewed-by: Lauren Winston <lwinston@google.com>
Cr-Commit-Position: refs/heads/main@{#1558333}

testing/variations/fieldtrial_testing_config.json

diff --git a/testing/variations/fieldtrial_testing_config.json b/testing/variations/fieldtrial_testing_config.json
index a5b0afb..2bd910a 100644
--- a/testing/variations/fieldtrial_testing_config.json
+++ b/testing/variations/fieldtrial_testing_config.json
@@ -20622,6 +20622,27 @@
             ]
         }
     ],
+    "ReadAnythingMenuShuffleExperiment": [
+        {
+            "platforms": [
+                "chromeos",
+                "linux",
+                "mac",
+                "windows"
+            ],
+            "experiments": [
+                {
+                    "name": "EnabledWithSeparation",
+                    "params": {
+                        "read_anything_menu_shuffle_group_name": "MenuShuffleSeparation"
+                    },
+                    "enable_features": [
+                        "ReadAnythingMenuShuffleExperiment"
+                    ]
+                }
+            ]
+        }
+    ],
     "ReadAnythingReadAloudPhraseHighlighting": [
         {
             "platforms": [