Replace ValueSetOutputFormatter with HistogramSetJsonOutputFormatter.

telemetry/telemetry/internal/results/output_formatter.py

Index: telemetry/telemetry/internal/results/output_formatter.py
diff --git a/telemetry/telemetry/internal/results/output_formatter.py b/telemetry/telemetry/internal/results/output_formatter.py
index 89dcad1be4719e7bd33fddcdfab48d22f5c5a422..ccd49d28f92d6edc078b34d0ad40615da9c215ce 100644
--- a/telemetry/telemetry/internal/results/output_formatter.py
+++ b/telemetry/telemetry/internal/results/output_formatter.py
@@ -2,6 +2,8 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
+import os
+
 from telemetry.value import summary as summary_module
 
 class OutputFormatter(object):
@@ -33,6 +35,9 @@ class OutputFormatter(object):
     """
     raise NotImplementedError()
 
+  def PrintViewResults(self):
+    print 'View result at file://' + os.path.abspath(self.output_stream.name)
+
   def FormatDisabled(self):
     """Formats disabled results into the output stream.