[finch][code cache] Add an entry for CodeCacheDeduplicationStudy

Change-Id: I65a4017b1b810d9deb0594e6fc63fdf3d89d30fb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2575050Reviewed-by: Alexei Svitkine <asvitkine@chromium.org>
Commit-Queue: Bill Budge <bbudge@chromium.org>
Cr-Commit-Position: refs/heads/master@{#833871}

testing/variations/fieldtrial_testing_config.json

@@ -1732,6 +1732,25 @@
             ]
         }
     ],
+    "CodeCacheDeduplicationStudy": [
+        {
+            "platforms": [
+                "android",
+                "chromeos",
+                "linux",
+                "mac",
+                "windows"
+            ],
+            "experiments": [
+                {
+                    "name": "Enabled",
+                    "enable_features": [
+                        "CodeCacheDeduplicationStudy"
+                    ]
+                }
+            ]
+        }
+    ],
     "CodeCacheDeletionWithoutFilter": [
         {
             "platforms": [