Creating webkit_layout_tests target.

testing/buildbot/gn_isolate_map.pyl

Index: testing/buildbot/gn_isolate_map.pyl
diff --git a/testing/buildbot/gn_isolate_map.pyl b/testing/buildbot/gn_isolate_map.pyl
index b8c2c88c467e7bc8e27ddd7b8d4da505a07f43eb..fc2c0a1acc98809bbff8a4b8dcfab9963212307f 100644
--- a/testing/buildbot/gn_isolate_map.pyl
+++ b/testing/buildbot/gn_isolate_map.pyl
@@ -877,6 +877,18 @@
     "label": "//chrome/android/webapk/shell_apk:webapk_shell_apk_junit_tests",
     "type": "junit_test",
   },
+  "webkit_layout_tests": {
+    "label": "//:webkit_layout_tests",
+    "type": "script",
+    "script": "//testing/scripts/run_telemetry_as_googletest.py",
+    "args": [
+      "--xvfb",
+      "../../third_party/WebKit/Tools/Scripts/run-webkit-tests",
+      "--clobber-old-results",
+      "--no-show-results",
+      "--results-directory", "${ISOLATED_OUTDIR}/layout-test-results",
+    ],
+  },
   "webkit_unit_tests": {
     "label": "//third_party/WebKit/Source/web:webkit_unit_tests",
     "type": "console_test_launcher",