[Telemetry] Add capability for values to reference external files.

tools/telemetry/telemetry/results/json_output_formatter_unittest.py

Index: tools/telemetry/telemetry/results/json_output_formatter_unittest.py
diff --git a/tools/telemetry/telemetry/results/json_output_formatter_unittest.py b/tools/telemetry/telemetry/results/json_output_formatter_unittest.py
index 8c5af58e07ecb990163c90fb75e3caaae640911e..5286025ddc1f323c19c4e7fbabee3584f9fc26a9 100644
--- a/tools/telemetry/telemetry/results/json_output_formatter_unittest.py
+++ b/tools/telemetry/telemetry/results/json_output_formatter_unittest.py
@@ -10,8 +10,9 @@ from telemetry import benchmark
 from telemetry.page import page_set
 from telemetry.results import json_output_formatter
 from telemetry.results import page_test_results
+from telemetry.timeline import timeline_data
 from telemetry.value import scalar
-
+from telemetry.value import trace
 
 def _MakePageSet():
   ps = page_set.PageSet(file_path=os.path.dirname(__file__))
@@ -25,6 +26,20 @@ def _HasPage(pages, page):
 def _HasValueNamed(values, name):
   return len([x for x in values if x['name'] == name]) == 1
 
+class TimelineDataForTest(timeline_data.TimelineData):
+  def __init__(self):
+    super(TimelineDataForTest, self).__init__()
+    self._event_data = 'foo'
+
+  def Serialize(self, f):
+    f.write(self._event_data)
+    f.flush()
+    os.fsync(f)
+
+  def EventData(self):
+    return self._event_data
+
+
 class JsonOutputFormatterTest(unittest.TestCase):
   def setUp(self):
     self._output = StringIO.StringIO()
@@ -96,3 +111,26 @@ class JsonOutputFormatterTest(unittest.TestCase):
 
     self.assertFalse(d['pages'])
     self.assertTrue(_HasValueNamed(d['summary_values'], 'baz'))
+
+  def testAsDictWithFile(self):
+    results = page_test_results.PageTestResults()
+    v = trace.TraceValue(None, 'foo', TimelineDataForTest())
+    results.AddSummaryValue(v)
+
+    d = json_output_formatter.ResultsAsDict(results,
+        self._formatter.benchmark_metadata)
+
+    file_id = v.GetAssociatedFileHandle().id
+    name = str(file_id) + '.json'
+    self.assertEquals(d['files'][file_id], name)
+    os.remove('0.json')
+
+  def testAsDictWithoutFile(self):
+    results = page_test_results.PageTestResults()
+    v = scalar.ScalarValue(None, 'baz', 'seconds', 5)
+    results.AddSummaryValue(v)
+
+    d = json_output_formatter.ResultsAsDict(results,
+        self._formatter.benchmark_metadata)
+
+    self.assertNotIn('files', d)