Add an "in_unit_test_mode" attribute to the environment. Use this to default output format to 'gtes…

tools/telemetry/telemetry/results/results_options.py

Index: tools/telemetry/telemetry/results/results_options.py
diff --git a/tools/telemetry/telemetry/results/results_options.py b/tools/telemetry/telemetry/results/results_options.py
index d64c4e691f3d0a65350832f6e8bdffcb2c0bd0a7..83acae152782fca4a13cd9a96540c45d90df9b0a 100644
--- a/tools/telemetry/telemetry/results/results_options.py
+++ b/tools/telemetry/telemetry/results/results_options.py
@@ -7,7 +7,6 @@ import os
 import sys
 
 from telemetry.core import util
-from telemetry.page import page_measurement
 from telemetry.results import block_page_measurement_results
 from telemetry.results import buildbot_page_measurement_results
 from telemetry.results import csv_page_measurement_results
@@ -44,11 +43,6 @@ def AddResultsOptions(parser):
 
 
 def PrepareResults(test, options):
-  if not isinstance(test, page_measurement.PageMeasurement):
-    # Sort of hacky. The default for non-Measurements should be "gtest."
-    if options.output_format != 'none':
-      options.output_format = 'gtest'
-
   if options.output_format == 'html' and not options.output_file:
     options.output_file = os.path.join(util.GetBaseDir(), 'results.html')