[Sync] Finch Experiment : Enable compression between sync client and server

testing/variations/fieldtrial_testing_config_android.json

Index: testing/variations/fieldtrial_testing_config_android.json
diff --git a/testing/variations/fieldtrial_testing_config_android.json b/testing/variations/fieldtrial_testing_config_android.json
index 403958ca20e988e6f5174dafc2b84b3d6fbdae55..16be734cbe5645417ce809a171712cf649244721 100644
--- a/testing/variations/fieldtrial_testing_config_android.json
+++ b/testing/variations/fieldtrial_testing_config_android.json
@@ -188,5 +188,13 @@
         {
             "group_name": "v=1:Prefetching=Learning"
         }
+    ],
+    "SyncHttpContentCompression": [
+        {
+            "group_name": "Enabled"
+        },
+        {
+            "group_name": "Disabled"
+        }
     ]
 }