Add field trial config for NetAdaptiveProxyConnectionTimeout

testing/variations/fieldtrial_testing_config.json

Index: testing/variations/fieldtrial_testing_config.json
diff --git a/testing/variations/fieldtrial_testing_config.json b/testing/variations/fieldtrial_testing_config.json
index 149ffb463fc666c81fdb01aa090a08c4a8a5d83f..83aa7a2eb6078605c8c7780e40511cea9a0afbcf 100644
--- a/testing/variations/fieldtrial_testing_config.json
+++ b/testing/variations/fieldtrial_testing_config.json
@@ -569,10 +569,7 @@
             ],
             "experiments": [
                 {
-                    "name": "Enabled_Warmup",
-                    "params": {
-                        "enable_warmup": "true"
-                    }
+                    "name": "Enabled"
                 }
             ]
         }
@@ -1636,6 +1633,18 @@
             ]
         }
     ],
+    "NetAdaptiveProxyConnectionTimeout": [
+        {
+            "platforms": [
+                "android"
+            ],
+            "experiments": [
+                {
+                    "name": "Enabled"
+                }
+            ]
+        }
+    ],
     "NetDelayableH2AndQuicRequests": [
         {
             "platforms": [