Add module discovery and autoloading to expect_tests.

scripts/slave/unittests/expect_tests/cover.py

 # Copyright 2014 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.
 
 from cStringIO import StringIO
 
 import test_env  # pylint: disable=W0611
 
 import coverage
 
@@ skipping 18 matching lines @@
         self.c._warn_no_data = False
       self.c.start()
 
   def __exit__(self, *_):
     if self.enabled:
       self.c.stop()
       self.c.save()
 
 
 class CoverageContext(object):
-  def __init__(self, name, cover_branches, html_report, enabled=True):
+  def __init__(self, cover_branches, html_report, enabled=True):
     self.opts = None
     self.cov = None
     self.enabled = enabled
 
     self.html_report = html_report
 
     if enabled:
       self.opts = {
-        'data_file': '.%s_coverage' % name,
+        'data_file': '.expect_tests_coverage',
         'data_suffix': True,
         'branch': cover_branches,
       }
       self.cov = coverage.coverage(**self.opts)
       self.cov.erase()
 
   def cleanup(self):
     if self.enabled:
       self.cov.combine()
 
@@ skipping 19 matching lines @@
         print
         print 'FATAL: Test coverage is not at 100%.'
 
     return not fail
 
   def create_subprocess_context(self):
     # Can't have this method be the contextmanager because otherwise
     # self (and self.cov) will get pickled to the subprocess, and we don't want
     # that :(
     return _Cover(self.enabled, self.opts)