Add testing configs for ParseHTMLOnMainThread experiment

testing/variations/fieldtrial_testing_config_win.json

 {
     "AutofillClassifier": [
         {
             "group_name": "Enabled"
         }
     ],
     "AutofillFieldMetadata": [
         {
             "group_name": "Enabled"
         }
@@ skipping 213 matching lines @@
     "OutOfProcessPac": [
         {
             "group_name": "Enabled"
         }
     ],
     "PageRevisitInstrumentation": [
         {
             "group_name": "Enabled"
         }
     ],
+    "ParseHTMLOnMainThread": [
+        {
+            "disable_features": [
+                "ParseHTMLOnMainThread"
+            ],
+            "group_name": "Enabled_CoalesceChunks",
+            "params": {
+                "parseHTMLOnMainThreadCoalesceChunks": "true",
+                "parseHTMLOnMainThreadSyncTokenize": "false"
+            }
+        }
+    ],
     "PasswordBranding": [
         {
             "group_name": "SmartLockBrandingSavePromptOnly"
         }
     ],
     "PasswordGeneration": [
         {
             "group_name": "Disabled"
         }
     ],
@@ skipping 252 matching lines @@
     ],
     "use-new-media-cache": [
         {
             "enable_features": [
                 "use-new-media-cache"
             ],
             "group_name": "Enabled"
         }
     ]
 }