Add swarming support for MB (and the GN bots) in the chromium recipes.

scripts/slave/recipes/chromium.expected/full_chromium_webkit_WebKit_Linux.json

 [
   {
     "cmd": [
       "python",
       "-u",
       "[BUILD]/scripts/slave/bot_update.py",
       "--master",
       "chromium.webkit",
       "--builder",
       "WebKit Linux",
@@ skipping 125 matching lines @@
     "name": "get compile targets for scripts",
     "~followup_annotations": [
       "@@@STEP_LOG_LINE@json.output@{}@@@",
       "@@@STEP_LOG_END@json.output@@@"
     ]
   },
   {
     "cmd": [
       "python",
       "-u",
+      "RECIPE_MODULE[isolate]/resources/find_isolated_tests.py",
+      "--build-dir",
+      "[SLAVE_BUILD]/src/out/Release",
+      "--output-json",
+      "/path/to/tmp/json"
+    ],
+    "cwd": "[SLAVE_BUILD]",
+    "name": "find isolated tests",
+    "~followup_annotations": [
+      "@@@STEP_LOG_LINE@json.output@{@@@",
+      "@@@STEP_LOG_LINE@json.output@  \"dummy_target_1\": \"[dummy hash for dummy_target_1]\", @@@",
+      "@@@STEP_LOG_LINE@json.output@  \"dummy_target_2\": \"[dummy hash for dummy_target_2]\"@@@",
+      "@@@STEP_LOG_LINE@json.output@}@@@",
+      "@@@STEP_LOG_END@json.output@@@",
+      "@@@SET_BUILD_PROPERTY@swarm_hashes@{\"dummy_target_1\": \"[dummy hash for dummy_target_1]\", \"dummy_target_2\": \"[dummy hash for dummy_target_2]\"}@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "python",
+      "-u",
       "[BUILD]/scripts/slave/cleanup_temp.py"
     ],
     "cwd": "[SLAVE_BUILD]",
     "name": "cleanup_temp"
   },
   {
     "cmd": [
       "python",
       "-u",
       "RECIPE_MODULE[isolate]/resources/find_isolated_tests.py",
@@ skipping 60 matching lines @@
       "@@@STEP_LOG_LINE@json.output@{@@@",
       "@@@STEP_LOG_LINE@json.output@  \"browser_tests\": \"[dummy hash for browser_tests]\"@@@",
       "@@@STEP_LOG_LINE@json.output@}@@@",
       "@@@STEP_LOG_END@json.output@@@"
     ]
   },
   {
     "cmd": [
       "python",
       "-u",
-      "RECIPE_MODULE[isolate]/resources/find_isolated_tests.py",
-      "--build-dir",
-      "[SLAVE_BUILD]/src/out/Release",
-      "--output-json",
-      "/path/to/tmp/json"
+      "[SLAVE_BUILD]/src/tools/swarming_client/swarming.py",
+      "trigger",
+      "--swarming",
+      "https://chromium-swarm.appspot.com",
+      "--isolate-server",
+      "https://isolateserver.appspot.com",
+      "--priority",
+      "25",
+      "--shards",
+      "1",
+      "--task-name",
+      "browser_tests/Ubuntu-12.04/[dummy has/WebKit Linux/571",
+      "--dump-json",
+      "/path/to/tmp/json",
+      "--expiration",
+      "3600",
+      "--io-timeout",
+      "1200",
+      "--hard-timeout",
+      "3600",
+      "--dimension",
+      "cpu",
+      "x86-64",
+      "--dimension",
+      "gpu",
+      "none",
+      "--dimension",
+      "os",
+      "Ubuntu-12.04",
+      "--dimension",
+      "pool",
+      "Chrome",
+      "--tag",
+      "buildername:WebKit Linux",
+      "--tag",
+      "buildnumber:571",
+      "--tag",
+      "data:[dummy hash for browser_tests]",
+      "--tag",
+      "master:chromium.webkit",
+      "--tag",
+      "name:browser_tests",
+      "--tag",
+      "os:Ubuntu-12.04",
+      "--tag",
+      "project:chromium",
+      "--tag",
+      "purpose:CI",
+      "--tag",
+      "purpose:post-commit",
+      "--idempotent",
+      "[dummy hash for browser_tests]",
+      "--",
+      "--test-launcher-summary-output=${ISOLATED_OUTDIR}/output.json"
     ],
     "cwd": "[SLAVE_BUILD]",
-    "name": "find isolated tests",
+    "name": "[trigger] browser_tests",
     "~followup_annotations": [
       "@@@STEP_LOG_LINE@json.output@{@@@",
-      "@@@STEP_LOG_LINE@json.output@  \"dummy_target_1\": \"[dummy hash for dummy_target_1]\", @@@",
-      "@@@STEP_LOG_LINE@json.output@  \"dummy_target_2\": \"[dummy hash for dummy_target_2]\"@@@",
+      "@@@STEP_LOG_LINE@json.output@  \"base_task_name\": \"browser_tests/Ubuntu-12.04/[dummy has/WebKit Linux/571\", @@@",
+      "@@@STEP_LOG_LINE@json.output@  \"tasks\": {@@@",
+      "@@@STEP_LOG_LINE@json.output@    \"browser_tests/Ubuntu-12.04/[dummy has/WebKit Linux/571\": {@@@",
+      "@@@STEP_LOG_LINE@json.output@      \"shard_index\": 0, @@@",
+      "@@@STEP_LOG_LINE@json.output@      \"task_id\": \"10000\", @@@",
+      "@@@STEP_LOG_LINE@json.output@      \"view_url\": \"https://chromium-swarm.appspot.com/user/task/10000\"@@@",
+      "@@@STEP_LOG_LINE@json.output@    }@@@",
+      "@@@STEP_LOG_LINE@json.output@  }@@@",
       "@@@STEP_LOG_LINE@json.output@}@@@",
       "@@@STEP_LOG_END@json.output@@@",
-      "@@@SET_BUILD_PROPERTY@swarm_hashes@{\"dummy_target_1\": \"[dummy hash for dummy_target_1]\", \"dummy_target_2\": \"[dummy hash for dummy_target_2]\"}@@@"
+      "@@@STEP_LINK@shard #0@https://chromium-swarm.appspot.com/user/task/10000@@@"
     ]
   },
   {
-    "cmd": [
-      "python",
-      "-u",
-      "\nimport sys\nprint '*.isolated file for target %s is missing' % sys.argv[1]\nsys.exit(1)\n",
-      "browser_tests"
-    ],
-    "cwd": "[SLAVE_BUILD]",
-    "name": "[error] browser_tests",
-    "~followup_annotations": [
-      "@@@STEP_LOG_LINE@python.inline@@@@",
-      "@@@STEP_LOG_LINE@python.inline@import sys@@@",
-      "@@@STEP_LOG_LINE@python.inline@print '*.isolated file for target %s is missing' % sys.argv[1]@@@",
-      "@@@STEP_LOG_LINE@python.inline@sys.exit(1)@@@",
-      "@@@STEP_LOG_END@python.inline@@@"
-    ]
-  },
-  {
     "cmd": [
       "python",
       "-u",
       "[BUILD]/scripts/slave/runtest.py",
       "--target",
       "Release",
       "--no-xvfb",
       "--factory-properties",
       "{\"blamelist\": [\"cool_dev1337@chromium.org\", \"hax@chromium.org\"], \"buildername\": \"WebKit Linux\", \"buildnumber\": 571, \"mastername\": \"chromium.webkit\", \"parent_buildername\": null, \"recipe\": \"chromium\", \"slavename\": \"TestSlavename\", \"workdir\": \"/path/to/workdir/TestSlavename\"}",
       "--build-properties",
@@ skipping 46 matching lines @@
       "{\"blamelist\": [\"cool_dev1337@chromium.org\", \"hax@chromium.org\"], \"buildername\": \"WebKit Linux\", \"buildnumber\": 571, \"mastername\": \"chromium.webkit\", \"parent_buildername\": null, \"recipe\": \"chromium\", \"slavename\": \"TestSlavename\", \"workdir\": \"/path/to/workdir/TestSlavename\"}"
     ],
     "cwd": "[SLAVE_BUILD]",
     "name": "archive_webkit_tests_results",
     "~followup_annotations": [
       "@@@STEP_LINK@layout_test_results@https://storage.googleapis.com/chromium-layout-test-archives/WebKit_Linux/571/layout-test-results/results.html@@@",
       "@@@STEP_LINK@(zip)@https://storage.googleapis.com/chromium-layout-test-archives/WebKit_Linux/571/layout-test-results.zip@@@"
     ]
   },
   {
+    "allow_subannotations": true,
     "cmd": [
       "python",
       "-u",
-      "\nimport sys\nprint '%s wasn\\'t triggered' % sys.argv[1]\nsys.exit(1)\n",
-      "browser_tests"
+      "RECIPE_MODULE[swarming]/resources/collect_gtest_task.py",
+      "--swarming-client-dir",
+      "[SLAVE_BUILD]/src/tools/swarming_client",
+      "--temp-root-dir",
+      "[TMP_BASE]",
+      "--merged-test-output",
+      "/path/to/tmp/json",
+      "--",
+      "collect",
+      "--swarming",
+      "https://chromium-swarm.appspot.com",
+      "--decorate",
+      "--print-status-updates",
+      "--shards",
+      "1",
+      "browser_tests/Ubuntu-12.04/[dummy has/WebKit Linux/571"
     ],
     "cwd": "[SLAVE_BUILD]",
-    "name": "[collect error] browser_tests",
-    "~followup_annotations": [
-      "@@@STEP_LOG_LINE@python.inline@@@@",
-      "@@@STEP_LOG_LINE@python.inline@import sys@@@",
-      "@@@STEP_LOG_LINE@python.inline@print '%s wasn\\'t triggered' % sys.argv[1]@@@",
-      "@@@STEP_LOG_LINE@python.inline@sys.exit(1)@@@",
-      "@@@STEP_LOG_END@python.inline@@@"
-    ]
+    "name": "browser_tests"
   }
 ]