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

content/test/gpu/gpu_tests/gpu_process.py

 # Copyright 2013 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 gpu_process_expectations as expectations
 import page_sets
 
 from telemetry import benchmark
 from telemetry.page import page_set
 from telemetry.page import page_test
 
 test_harness_script = r"""
   var domAutomationController = {};
   domAutomationController._finished = false;
   domAutomationController.setAutomationId = function(id) {}
   domAutomationController.send = function(msg) {
     domAutomationController._finished = true;
   }
 
   window.domAutomationController = domAutomationController;
 """
 
 class _GpuProcessValidator(page_test.PageTest):
+  options = {'output_format': 'gtest'}
+
   def __init__(self):
     super(_GpuProcessValidator, self).__init__(
         needs_browser_restart_after_each_page=True)
 
   def CustomizeBrowserOptions(self, options):
     options.AppendExtraBrowserArgs('--enable-gpu-benchmarking')
 
   def ValidatePage(self, page, tab, results):
     has_gpu_process_js = 'chrome.gpuBenchmarking.hasGpuProcess()'
     has_gpu_process = tab.EvaluateJavaScript(has_gpu_process_js)
     if not has_gpu_process:
       raise page_test.Failure('No GPU process detected')
 
 class GpuProcess(benchmark.Benchmark):
   """Tests that accelerated content triggers the creation of a GPU process"""
   test = _GpuProcessValidator
   page_set = page_sets.GpuProcessTestsPageSet
 
   def CreateExpectations(self, page_set):
     return expectations.GpuProcessExpectations()
 
   def CreatePageSet(self, options):
     page_set = super(GpuProcess, self).CreatePageSet(options)
     for page in page_set.pages:
       page.script_to_evaluate_on_commit = test_harness_script
     return page_set