Swarm layout tests on Mojo Linux FYI bot.

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 e8d493e24384f487d7a70f99e41a53d0e07aa304..ab79ff6b4f7a11108dac0a8e10d1b627b1a6a2f5 100644
--- a/testing/buildbot/chromium.fyi.json
+++ b/testing/buildbot/chromium.fyi.json
@@ -11711,6 +11711,40 @@
         },
         "test": "content_browsertests"
       }
+    ],
+    "isolated_scripts": [
+      {
+        "args": [
+          "--additional-driver-flag=--enable-network-service"

[jam, 2017/06/06 22:06:33]

this is all copied other than the args. this should work right?

[Dirk Pranke, 2017/06/07 01:19:04]

Yes, this should all work, though it is, sadly, way too verbose. Hopefully we
can get that to be more concise soon.

+        ],
+        "isolate_name": "webkit_layout_tests_exparchive",
+        "merge": {
+          "args": [
+            "--verbose",
+            "--results-json-override-with-build-property",
+            "build_number",
+            "buildnumber",
+            "--results-json-override-with-build-property",
+            "builder_name",
+            "buildername",
+            "--results-json-override-with-build-property",
+            "chromium_revision",
+            "got_revision_cp"
+          ],
+          "script": "//third_party/WebKit/Tools/Scripts/merge-layout-test-results"
+        },
+        "name": "webkit_layout_tests",
+        "results_handler": "layout tests",
+        "swarming": {
+          "can_use_on_swarming_builders": true,
+          "dimension_sets": [
+            {
+              "os": "Ubuntu-14.04"
+            }
+          ],
+          "shards": 6
+        }
+      }
     ]
   },
   "Mojo Windows": {