Flip GN bots to be purely driven by //testing/buildbot/*.json files for tests.

scripts/slave/recipes/chromium_gn.expected/full_tryserver_v8_v8_linux_chromium_gn_rel.json

Index: scripts/slave/recipes/chromium_gn.expected/full_tryserver_v8_v8_linux_chromium_gn_rel.json
diff --git a/scripts/slave/recipes/chromium_gn.expected/full_tryserver_v8_v8_linux_chromium_gn_rel.json b/scripts/slave/recipes/chromium_gn.expected/full_tryserver_v8_v8_linux_chromium_gn_rel.json
index 752abe1a83bb932a8f6430c6ca08098233fe5f5a..89111c28ba8b18e19b381d7d4a3b6e7b94b03475 100644
--- a/scripts/slave/recipes/chromium_gn.expected/full_tryserver_v8_v8_linux_chromium_gn_rel.json
+++ b/scripts/slave/recipes/chromium_gn.expected/full_tryserver_v8_v8_linux_chromium_gn_rel.json
@@ -260,15 +260,32 @@
     "name": "compile"
   },
   {
+    "allow_subannotations": true,
     "cmd": [
       "python",
       "-u",
-      "[DEPOT_TOOLS]/gn.py",
-      "--root=[SLAVE_BUILD]/src",
-      "check",
-      "//out/Release"
+      "[BUILD]/scripts/slave/runtest.py",
+      "--target",
+      "Release",
+      "--xvfb",
+      "--factory-properties",
+      "{\"blamelist\": [\"cool_dev1337@chromium.org\", \"hax@chromium.org\"], \"branch\": \"\", \"buildername\": \"v8_linux_chromium_gn_rel\", \"buildnumber\": 571, \"issue\": 12853011, \"mastername\": \"tryserver.v8\", \"patch_project\": \"chromium\", \"patchset\": 1, \"project\": \"chrome\", \"recipe\": \"chromium_gn\", \"repository\": \"\", \"requester\": \"commit-bot@chromium.org\", \"revision\": \"HEAD\", \"rietveld\": \"https://codereview.chromium.org\", \"slavename\": \"TestSlavename\", \"workdir\": \"/path/to/workdir/TestSlavename\"}",
+      "--build-properties",
+      "{\"blamelist\": [\"cool_dev1337@chromium.org\", \"hax@chromium.org\"], \"branch\": \"\", \"buildername\": \"v8_linux_chromium_gn_rel\", \"buildnumber\": 571, \"issue\": 12853011, \"mastername\": \"tryserver.v8\", \"patch_project\": \"chromium\", \"patchset\": 1, \"project\": \"chrome\", \"recipe\": \"chromium_gn\", \"repository\": \"\", \"requester\": \"commit-bot@chromium.org\", \"revision\": \"HEAD\", \"rietveld\": \"https://codereview.chromium.org\", \"slavename\": \"TestSlavename\", \"workdir\": \"/path/to/workdir/TestSlavename\"}",
+      "--annotate=gtest",
+      "--test-type=base_unittests",
+      "--step-name=base_unittests (with patch)",
+      "--test-launcher-summary-output",
+      "/path/to/tmp/json",
+      "--generate-json-file",
+      "-o",
+      "gtest-results/base_unittests",
+      "--builder-name=v8_linux_chromium_gn_rel",
+      "--slave-name=TestSlavename",
+      "--build-number=571",
+      "base_unittests"
     ],
     "cwd": "[SLAVE_BUILD]",
-    "name": "gn check"
+    "name": "base_unittests (with patch)"
   }
 ]