Add a Linux bot to run servicification related tests.

testing/buildbot/chromium.fyi.json

Index: testing/buildbot/chromium.fyi.json
diff --git a/testing/buildbot/chromium.fyi.json b/testing/buildbot/chromium.fyi.json
index d06725f30a40421615b358943d0f1325ca1eac8c..5690afa7c9948c2178e774992d323c227a7a96fb 100644
--- a/testing/buildbot/chromium.fyi.json
+++ b/testing/buildbot/chromium.fyi.json
@@ -11783,6 +11783,21 @@
       }
     ]
   },
+  "Mojo Linux": {
+    "gtest_tests": [
+      {
+        "args": [
+          "--enable-network-service",
+          "--test-launcher-filter-file=../../testing/buildbot/filters/mojo.fyi.network_content_browsertests.filter"
+        ],
+        "name": "network_service_content_browsertests",
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
+        "test": "content_browsertests"
+      }
+    ]
+  },
   "Mojo Windows": {
     "additional_compile_targets": [
       "mash:all"