diagnose_goma show summary as step text.

scripts/slave/recipe_modules/chromium_tests/steps.py

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import re
 import string
 
 
 class Test(object):
   """
@@ skipping 1825 matching lines @@
   def name(self):
     return 'diagnose_goma'
 
   @staticmethod
   def compile_targets(_):
     return []
 
   def run(self, api, suffix, test_filter=None):
     diagnose_goma_log_py = api.path['build'].join('goma',
                                                   'diagnose_goma_log.py')
-    api.python('diagnose_goma', diagnose_goma_log_py, [])
+    api.python('diagnose_goma', diagnose_goma_log_py,
+               ['--output-json', api.json.output()])
+    step_result = api.step.active_result
+    out_json = step_result.json
+    text_output = [
+        'version %(goma_version)s, commit %(goma_revision)s' % output_json,
+        'Fatal %(fatal)d, Error %(error)d, Warning %(warning)d' %
+        output_json['stats']
+    ]
+    text_output.extend(out_json['messages'])
+    step_result.presentation.step_text += api.test_utils.format_step_text(
+        text_output)
 
 
 class IncrementalCoverageTest(Test):
   name = 'incremental_coverage'
 
   @property
   def uses_local_devices(self):
     return True
 
   def has_valid_results(self, api, suffix):
@@ skipping 15 matching lines @@
   def run(self, api, suffix, test_filter=None):
     api.chromium_android.coverage_report(upload=False)
     api.chromium_android.get_changed_lines_for_revision()
     api.chromium_android.incremental_coverage_report()
 
 
 GOMA_TESTS = [
   GTestTest('base_unittests'),
   GTestTest('content_unittests'),
 ]