[WPT Export] Add "github" remote repo in LocalWPT constructor if it doesn't exist.

third_party/WebKit/Tools/Scripts/webkitpy/w3c/local_wpt.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.
 
 """A utility class for interacting with a local checkout of the Web Platform Tests."""
 
 import logging
 
 from webkitpy.common.system.executive import ScriptError
 from webkitpy.w3c.chromium_commit import ChromiumCommit
 
 WPT_REPO_URL = 'https://chromium.googlesource.com/external/w3c/web-platform-tests.git'
 WPT_TMP_DIR = '/tmp/wpt'
 CHROMIUM_WPT_DIR = 'third_party/WebKit/LayoutTests/imported/wpt/'
 
 _log = logging.getLogger(__name__)
 
 
 class LocalWPT(object):
 
     def __init__(self, host, path=WPT_TMP_DIR, no_fetch=False, use_github=False):
         """
         Args:
             host: A Host object.
             path: Optional, the directory where LocalWPT will check out web-platform-tests.
             no_fetch: Optional, passing true will skip updating the local WPT.
                 Intended for use only in development after fetching once.
             use_github: Optional, passing true will check if the GitHub remote is enabled

[qyearsley, 2017/01/10 20:42:46]

Is this argument now unused?

                 (necessary for later pull request steps).
         """
         self.host = host
         self.path = path
         self.branch_name = 'chromium-export-try'
 
         if no_fetch:
             _log.info('Skipping remote WPT fetch')
             return
 
         if self.host.filesystem.exists(self.path):
             _log.info('WPT checkout exists at %s, fetching latest', self.path)
             self.run(['git', 'fetch', '--all'])
             self.run(['git', 'checkout', 'origin/master'])
         else:
             _log.info('Cloning %s into %s', WPT_REPO_URL, self.path)
             self.host.executive.run_command(['git', 'clone', WPT_REPO_URL, self.path])
 
-        if use_github and 'github' not in self.run(['git', 'remote']):
-            raise Exception('Need to set up remote "github"')
+        if 'github' not in self.run(['git', 'remote']):
+            self.run(['git', 'remote', 'add', 'github', 'git@github.com:w3c/web-platform-tests.git'])
 
     def run(self, command, **kwargs):
         """Runs a command in the local WPT directory."""
         return self.host.executive.run_command(command, cwd=self.path, **kwargs)
 
     def most_recent_chromium_commit(self):
         """Finds the most recent commit in WPT with a Chromium commit position."""
         sha = self.run(['git', 'rev-list', 'HEAD', '-n', '1', '--grep=Cr-Commit-Position'])
         if not sha:
             return None, None
@@ skipping 72 matching lines @@
 
     def commits_behind_master(self, commit):
         """Returns the number of commits after the given commit on origin/master.
 
         This doesn't include the given commit, and this assumes that the given
         commit is on the the master branch.
         """
         return len(self.run([
             'git', 'rev-list', '{}..origin/master'.format(commit)
         ]).splitlines())