Enable loading.desktop benchmark with network service enabled on perf fyi bot.

testing/buildbot/chromium.perf.fyi.json

 {
   "AAAAA1 AUTOGENERATED FILE DO NOT EDIT": {},
   "AAAAA2 See //tools/perf/generate_perf_data.py to make changes": {},
   "Android Swarming N5X Tester": {
     "isolated_scripts": [
       {
         "args": [
           "battor.steady_state",
           "-v",
           "--upload-results",
@@ skipping 4736 matching lines @@
             }
           ],
           "expiration": 36000,
           "hard_timeout": 10800,
           "ignore_task_failure": true,
           "io_timeout": 3600
         }
       }
     ]
   },
+  "Mojo Linux Perf": {
+    "isolated_scripts": [
+      {
+        "args": [
+          "loading.desktop.network_service",
+          "-v",
+          "--upload-results",
+          "--output-format=chartjson",
+          "--browser=release"
+        ],
+        "isolate_name": "telemetry_perf_tests",
+        "name": "loading.desktop.network_service",
+        "override_compile_targets": [
+          "telemetry_perf_tests"
+        ],
+        "swarming": {
+          "can_use_on_swarming_builders": true,
+          "expiration": 36000,
+          "hard_timeout": 10800,
+          "ignore_task_failure": false,
+          "io_timeout": 3600
+        }
+      }
+    ]
+  },
   "Win 10 4 Core Low-End Perf Tests": {
     "isolated_scripts": [
       {
         "args": [],
         "isolate_name": "angle_perftests",
         "name": "angle_perftests",
         "swarming": {
           "can_use_on_swarming_builders": true,
           "dimension_sets": [
             {
@@ skipping 9961 matching lines @@
           ],
           "expiration": 36000,
           "hard_timeout": 10800,
           "ignore_task_failure": true,
           "io_timeout": 3600
         }
       }
     ]
   }
 }