Plumb Telemetry test name through to results object creation

tools/telemetry/telemetry/results/json_output_formatter.py

Index: tools/telemetry/telemetry/results/json_output_formatter.py
diff --git a/tools/telemetry/telemetry/results/json_output_formatter.py b/tools/telemetry/telemetry/results/json_output_formatter.py
index 1b1496f4b46f6d387a965f500f40c2783870cdae..09e05a88eea951244f684de95cd7329e39d26cd3 100644
--- a/tools/telemetry/telemetry/results/json_output_formatter.py
+++ b/tools/telemetry/telemetry/results/json_output_formatter.py
@@ -6,9 +6,10 @@ import json
 
 from telemetry.results import output_formatter
 
-def ResultsAsDict(res):
+def ResultsAsDict(res, metadata):
   result_dict = {
-    'format_version': '0.1',
+    'format_version': '0.2',
+    'benchmark_name': metadata.name,
     'summary_values': [v.AsDict() for v in res.all_summary_values],
     'per_page_values': [v.AsDict() for v in res.all_page_specific_values],
     'pages': dict((p.id, p.AsDict()) for p in _all_pages(res))
@@ -21,9 +22,15 @@ def _all_pages(res):
   return pages
 
 class JsonOutputFormatter(output_formatter.OutputFormatter):
-  def __init__(self, output_stream):
+  def __init__(self, output_stream, metadata):
     super(JsonOutputFormatter, self).__init__(output_stream)
+    self._metadata = metadata
+
+  @property
+  def metadata(self):
+    return self._metadata
 
   def Format(self, page_test_results):
-    json.dump(ResultsAsDict(page_test_results), self.output_stream)
+    json.dump(ResultsAsDict(page_test_results, self.metadata),
+        self.output_stream)
     self.output_stream.write('\n')