Define DiagnosticMap and a basic Diagnostic hierarchy

telemetry/telemetry/value/common_value_helpers_unittest.py

 # Copyright 2016 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 unittest
 import os
 
 from perf_insights import function_handle
 from perf_insights.mre import failure
 from perf_insights.mre import job as job_module
@@ skipping 28 matching lines @@
     story_set = story.StorySet(base_dir=os.path.dirname(__file__))
     p = page.Page('http://www.foo.com/', story_set, story_set.base_dir)
 
     scalar_value = {
         'type': 'numeric',
         'numeric': {
             'type': 'scalar',
             'unit': 'timeInMs_smallerIsBetter',
             'value': 42
         },
-        'grouping_keys': {
-            'name': 'foo'
-        },
+        'name': 'foo',
         'options': {
             'description': 'desc'
         }
     }
 
     v = common_value_helpers.TranslateScalarValue(scalar_value, p)
 
     self.assertIsInstance(v, scalar.ScalarValue)
     self.assertEquals('foo', v.name)
     self.assertEquals(p, v.page)
     self.assertEquals('timeInMs', v.units)
     self.assertEquals(42, v.value)
     self.assertEquals(improvement_direction.DOWN, v.improvement_direction)
     self.assertEquals('desc', v.description)
 
   def testTranslateScalarNoneValue(self):
     story_set = story.StorySet(base_dir=os.path.dirname(__file__))
     p = page.Page('http://www.foo.com/', story_set, story_set.base_dir)
 
     scalar_value = {
         'type': 'numeric',
         'numeric': {
             'type': 'scalar',
             'unit': 'timeInMs_smallerIsBetter',
             'value': None
         },
-        'grouping_keys': {
-            'name': 'foo'
-        }
+        'name': 'foo'
     }
 
     v = common_value_helpers.TranslateScalarValue(scalar_value, p)
 
     self.assertIsNone(v.value)
     self.assertEquals('Common scalar contained None', v.none_value_reason)