Enable PassiveDocumentEventListeners on waterfall.

testing/variations/fieldtrial_testing_config_linux.json

 {
     "AsyncDNS": [
         {
             "group_name": "AsyncDNSA"
         }
     ],
     "AutofillClassifier": [
         {
             "group_name": "Enabled"
         }
@@ skipping 125 matching lines @@
     "OutOfProcessPac": [
         {
             "group_name": "Enabled"
         }
     ],
     "PageRevisitInstrumentation": [
         {
             "group_name": "Enabled"
         }
     ],
+    "PassiveDocumentEventListeners": [
+        {
+            "enable_features": [
+                "PassiveDocumentEventListeners"
+            ],
+            "group_name": "Enabled"
+        }
+    ],
     "PasswordBranding": [
         {
             "group_name": "SmartLockBrandingSavePromptOnly"
         }
     ],
     "PasswordManagerSettingsMigration": [
         {
             "group_name": "Enable"
         }
     ],
@@ skipping 215 matching lines @@
     ],
     "use-new-media-cache": [
         {
             "enable_features": [
                 "use-new-media-cache"
             ],
             "group_name": "Enabled"
         }
     ]
 }