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

content/test/gpu/gpu_tests/cloud_storage_test_base.py

Index: content/test/gpu/gpu_tests/cloud_storage_test_base.py
diff --git a/content/test/gpu/gpu_tests/cloud_storage_test_base.py b/content/test/gpu/gpu_tests/cloud_storage_test_base.py
index 9343a602f562b8047264fe8e97167aec143dcbca..e8b76bc292ec0aa31321f33afc473199f6949528 100644
--- a/content/test/gpu/gpu_tests/cloud_storage_test_base.py
+++ b/content/test/gpu/gpu_tests/cloud_storage_test_base.py
@@ -47,6 +47,8 @@ def _CompareScreenshotSamples(screenshot, expectations, device_pixel_ratio):
           str(actual_color.b) + "]")
 
 class ValidatorBase(page_test.PageTest):
+  options = {'output_format': 'gtest'}

[Ken Russell (switch to Gerrit), 2014/07/24 01:24:33]

Where is it documented that a class variable named "options" is consulted later?

+
   def __init__(self):
     super(ValidatorBase, self).__init__()
     # Parameters for cloud storage reference images.