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

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

Index: third_party/WebKit/Tools/Scripts/webkitpy/w3c/local_wpt.py
diff --git a/third_party/WebKit/Tools/Scripts/webkitpy/w3c/local_wpt.py b/third_party/WebKit/Tools/Scripts/webkitpy/w3c/local_wpt.py
index 54cb85e5ebd583e668dd18352409c69efdfd6a4c..05c9ac1a5b630d16a4f77a5543f2ea908874e583 100644
--- a/third_party/WebKit/Tools/Scripts/webkitpy/w3c/local_wpt.py
+++ b/third_party/WebKit/Tools/Scripts/webkitpy/w3c/local_wpt.py
@@ -44,8 +44,8 @@ class LocalWPT(object):
             _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."""