reland "rebaseline_server: download actual-results.json files from GCS instead of SVN"

tools/test_all.py

Index: tools/test_all.py
diff --git a/gm/rebaseline_server/test_all.py b/tools/test_all.py
similarity index 70%
copy from gm/rebaseline_server/test_all.py
copy to tools/test_all.py
index 299d1340f23ec78664070d96510f81d296a3feb6..6467a2160be7598a6d40014de8e63e62fc7878a9 100755
--- a/gm/rebaseline_server/test_all.py
+++ b/tools/test_all.py
@@ -7,16 +7,20 @@ Use of this source code is governed by a BSD-style license that can be
 found in the LICENSE file.
 
 Run all unittests within this directory tree, recursing into subdirectories.
-
-TODO(epoger): Launch this automatically on the housekeeper bot, but first make
-sure it works properly after having been checked out (from both git and svn)
 """
 
 import os
 import unittest
 
+from tests import skimage_self_test
+
 
 def main():
+  # First, run any tests that cannot be automatically discovered (because
+  # they don't use Python's unittest framework).
+  skimage_self_test.main()
+
+  # Now discover/run all tests that use Python's unittest framework.
   suite = unittest.TestLoader().discover(os.path.dirname(__file__),
                                          pattern='*_test.py')
   results = unittest.TextTestRunner(verbosity=2).run(suite)