Refactor the way that TestApi works so that it is actually useful.

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

 [
   {
     "cmd": [
       "python",
       "-u",
       "[DEPOT_TOOLS_ROOT]/gclient.py",
       "config",
       "--spec",
       "cache_dir = '[ROOT]/git_cache'\nsolutions = [{'custom_deps': {'src/third_party/WebKit/LayoutTests': None, 'src/webkit/data/layout_tests/LayoutTests': None}, 'custom_vars': {'googlecode_url': 'svn://svn-mirror.golo.chromium.org/%s', 'nacl_trunk': 'svn://svn-mirror.golo.chromium.org/native_client/trunk', 'sourceforge_url': 'svn://svn-mirror.golo.chromium.org/%(repo)s', 'webkit_trunk': 'svn://svn-mirror.golo.chromium.org/blink/trunk'}, 'deps_file': '.DEPS.git', 'managed': True, 'name': 'src', 'url': 'https://chromium.googlesource.com/chromium/src.git'}]"
     ],
@@ skipping 79 matching lines @@
       "--build-tool",
       "ninja",
       "--compiler",
       "goma",
       "--",
       "All",
       "chromium_builder_tests"
     ],
     "name": "compile",
     "~followup_annotations": [
+      "step returned non-zero exit code: 1",
       "@@@STEP_FAILURE@@@"
     ]
   }
 ]