Add support for cc_perftests and other non-telemetry gtest based tests.

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

 [
   {
     "cmd": [
       "python",
       "-u",
       "[BUILD]/scripts/slave/bot_update.py",
       "--master",
       "tryserver.chromium.linux",
       "--builder",
       "linux_chromium_rel_ng",
@@ skipping 120 matching lines @@
       "-u",
       "[SLAVE_BUILD]/src/testing/scripts/get_compile_targets.py",
       "--output",
       "/path/to/tmp/json",
       "--",
       "--build-config-fs",
       "Release",
       "--paths",
       "{\"build\": \"[BUILD]\", \"checkout\": \"[SLAVE_BUILD]/src\"}",
       "--properties",
-      "{\"buildername\": \"linux_chromium_rel_ng\", \"buildnumber\": 571, \"slavename\": \"TestSlavename\"}"
+      "{\"buildername\": \"linux_chromium_rel_ng\", \"buildnumber\": 571, \"mastername\": \"tryserver.chromium.linux\", \"slavename\": \"TestSlavename\", \"target_platform\": \"linux\"}"
     ],
     "name": "get compile targets for scripts",
     "~followup_annotations": [
       "@@@STEP_LOG_LINE@json.output@{}@@@",
       "@@@STEP_LOG_END@json.output@@@"
     ]
   },
   {
     "cmd": [
       "killall",
@@ skipping 1702 matching lines @@
       "https://chromium-swarm.appspot.com",
       "--decorate",
       "--print-status-updates",
       "--shards",
       "1",
       "tab_capture_end2end_tests on NVIDIA GPU on Linux (with patch)/Linux/[dummy has/linux_chromium_rel_ng/571"
     ],
     "name": "tab_capture_end2end_tests on NVIDIA GPU on Linux (with patch) on Linux"
   }
 ]