Added swarming step to the Blink trybots

scripts/slave/recipes/chromium_trybot.expected/swarming_missing_isolated.json

 [
   {
     "cmd": [
       "python",
       "-u",
       "[BUILD]/scripts/slave/bot_update.py",
       "--master",
       "tryserver.chromium.linux",
       "--builder",
       "linux_chromium_rel",
@@ skipping 279 matching lines @@
       "data:[dummy hash for base_unittests]",
       "--tag",
       "master:tryserver.chromium.linux",
       "--tag",
       "name:base_unittests (with patch)",
       "--tag",
       "os:Ubuntu-12.04",
       "--tag",
       "project:chromium",
       "--tag",
-      "purpose:ManualTS",
+      "purpose:CQ",
       "--tag",
       "purpose:pre-commit",
       "--tag",
       "rietveld:https://codereview.chromium.org/12853011/#ps1",
       "--idempotent",
+      "--user",
+      "joe@chromium.org",
       "[dummy hash for base_unittests]",
       "--",
       "--test-launcher-summary-output=${ISOLATED_OUTDIR}/output.json"
     ],
     "name": "[trigger] base_unittests (with patch)",
     "~followup_annotations": [
       "@@@STEP_LOG_LINE@json.output@{@@@",
       "@@@STEP_LOG_LINE@json.output@  \"base_task_name\": \"base_unittests (with patch)/Ubuntu-12.04/[dummy has/linux_chromium_rel/571\", @@@",
       "@@@STEP_LOG_LINE@json.output@  \"tasks\": {@@@",
       "@@@STEP_LOG_LINE@json.output@    \"base_unittests (with patch)/Ubuntu-12.04/[dummy has/linux_chromium_rel/571\": {@@@",
@@ skipping 106 matching lines @@
   {
     "allow_subannotations": true,
     "cmd": [
       "python",
       "-u",
       "[BUILD]/scripts/slave/runtest.py",
       "--target",
       "Release",
       "--xvfb",
       "--factory-properties",
-      "{\"blamelist\": [\"cool_dev1337@chromium.org\", \"hax@chromium.org\"], \"branch\": \"\", \"build_config\": \"Release\", \"buildername\": \"linux_chromium_rel\", \"buildnumber\": 571, \"issue\": 12853011, \"mastername\": \"tryserver.chromium.linux\", \"patchset\": 1, \"project\": \"chrome\", \"recipe\": \"chromium_trybot\", \"repository\": \"\", \"requester\": \"commit-bot@chromium.org\", \"revision\": null, \"rietveld\": \"https://codereview.chromium.org\", \"root\": \"src\", \"slavename\": \"TestSlavename\", \"workdir\": \"/path/to/workdir/TestSlavename\"}",
+      "{\"blamelist\": [\"joe@chromium.org\"], \"branch\": \"\", \"build_config\": \"Release\", \"buildername\": \"linux_chromium_rel\", \"buildnumber\": 571, \"issue\": 12853011, \"mastername\": \"tryserver.chromium.linux\", \"patchset\": 1, \"project\": \"chrome\", \"recipe\": \"chromium_trybot\", \"repository\": \"\", \"requester\": \"commit-bot@chromium.org\", \"revision\": null, \"rietveld\": \"https://codereview.chromium.org\", \"root\": \"src\", \"slavename\": \"TestSlavename\", \"workdir\": \"/path/to/workdir/TestSlavename\"}",
       "--build-properties",
-      "{\"blamelist\": [\"cool_dev1337@chromium.org\", \"hax@chromium.org\"], \"branch\": \"\", \"build_config\": \"Release\", \"buildername\": \"linux_chromium_rel\", \"buildnumber\": 571, \"issue\": 12853011, \"mastername\": \"tryserver.chromium.linux\", \"patchset\": 1, \"project\": \"chrome\", \"recipe\": \"chromium_trybot\", \"repository\": \"\", \"requester\": \"commit-bot@chromium.org\", \"revision\": null, \"rietveld\": \"https://codereview.chromium.org\", \"root\": \"src\", \"slavename\": \"TestSlavename\", \"workdir\": \"/path/to/workdir/TestSlavename\"}",
+      "{\"blamelist\": [\"joe@chromium.org\"], \"branch\": \"\", \"build_config\": \"Release\", \"buildername\": \"linux_chromium_rel\", \"buildnumber\": 571, \"issue\": 12853011, \"mastername\": \"tryserver.chromium.linux\", \"patchset\": 1, \"project\": \"chrome\", \"recipe\": \"chromium_trybot\", \"repository\": \"\", \"requester\": \"commit-bot@chromium.org\", \"revision\": null, \"rietveld\": \"https://codereview.chromium.org\", \"root\": \"src\", \"slavename\": \"TestSlavename\", \"workdir\": \"/path/to/workdir/TestSlavename\"}",
       "--annotate=gtest",
       "--test-type=telemetry_perf_unittests",
       "--builder-name=linux_chromium_rel",
       "--slave-name=TestSlavename",
       "--build-number=571",
       "--run-python-script",
       "[SLAVE_BUILD]/src/tools/perf/run_tests",
       "--browser=release",
       "--retry-limit=3",
       "--write-full-results-to",
@@ skipping 70 matching lines @@
       "@@@STEP_TEXT@TEST RESULTS WERE INVALID@@@",
       "@@@STEP_FAILURE@@@"
     ]
   },
   {
     "name": "$final_result",
     "reason": "Step('browser_tests') failed with return_code 1",
     "status_code": 1
   }
 ]