Skip commits that don't generate a patch + fixes to get export working

third_party/WebKit/Tools/Scripts/webkitpy/w3c/test_exporter_unittest.py

 # Copyright 2016 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 unittest
 
 from webkitpy.common.host_mock import MockHost
 from webkitpy.common.system.executive_mock import MockExecutive2
 from webkitpy.w3c.test_exporter import TestExporter
 from webkitpy.w3c.wpt_github_mock import MockWPTGitHub
@@ skipping 40 matching lines @@
             git_command = args[1]
             if git_command == 'rev-list':
                 return 'facebeef\ncafedad5'
             elif git_command == 'footers':
                 return 'fake-cr-position'
             elif git_command == 'show':
                 if 'cafedad5' in args:
                     return 'newer fake text'
                 elif 'facebeef' in args:
                     return 'older fake text'
+            elif git_command == 'remote':
+                return 'github'
+            elif git_command == 'format-patch':
+                return 'fake patch'
+            elif git_command == 'diff':
+                return 'fake patch diff'
             else:
                 return ''
 
         host.executive = MockExecutive2(run_command_fn=mock_command)
         wpt_github = MockWPTGitHub(pull_requests=[])
 
         TestExporter(host, wpt_github).run()
 
         self.assertEqual(wpt_github.calls, ['in_flight_pull_requests', 'create_pr'])
         self.assertEqual(wpt_github.pull_requests_created,
                          [('chromium-export-try', 'older fake text', 'older fake text')])