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

scripts/slave/recipe_modules/json/test_api.py

+from slave import recipe_api
+
+from .util import TestResults
+
+class JsonTestApi(recipe_api.RecipeTestApi):
+  @staticmethod
+  def output(data):
+    return {'json': {'output': data}}
+
+  @staticmethod
+  def test_output_object():
+    return TestResults()
+
+  def canned_test_output(self, good, passes=9001):
+    """Produces a 'json test results' compatible object with some canned tests.
+    Args:
+      good - Determines if this test result is passing or not.
+      passes - The number of (theoretically) passing tests.
+    """
+    bad = lambda fail_val: None if good else fail_val
+    t = self.test_output_object()
+    t.raw['num_passes'] = passes
+    t.add_result('good/totally-awesome.html', 'PASS')
+    t.add_result('flake/totally-flakey.html', 'PASS', bad('TIMEOUT PASS'))
+    t.add_result('tricky/totally-maybe-not-awesome.html', 'PASS', bad('FAIL'))
+    t.add_result('bad/totally-bad-probably.html', 'PASS', bad('FAIL'))
+    return {'json': {'test_results': t.as_jsonish()}}