Update web-platform-tests.

tests/wpt/web-platform-tests/tools/.gitignore

@@ -0,0 +1,6 @@
+*#
+*.py[co]
+*.sw[po]
+*~
+\#*
+

tests/wpt/web-platform-tests/tools/manifest/update.py

@@ -2,6 +2,7 @@
 import argparse
 import imp
 import os
+import sys
 
 import manifest
 import vcs
@@ -82,11 +83,32 @@ def create_parser():
     return parser
 
 
-def main():
+def find_top_repo():
+    path = here
+    rv = None
+    while path != "/":
+        if vcs.is_git_repo(path):
+            rv = path
+        path = os.path.abspath(os.path.join(path, os.pardir))
+
+    return rv
+
+def main(default_tests_root=None):
     opts = create_parser().parse_args()
 
     if opts.tests_root is None:
-        opts.tests_root = vcs.get_repo_root()
+        tests_root = None
+        if default_tests_root is not None:
+            tests_root = default_tests_root
+        else:
+            tests_root = find_top_repo()
+
+        if tests_root is None:
+            print >> sys.stderr, """No git repo found; could not determine test root.
+Run again with --test-root"""
+            sys.exit(1)
+
+        opts.tests_root = tests_root
 
     if opts.path is None:
         opts.path = os.path.join(opts.tests_root, "MANIFEST.json")

tests/wpt/web-platform-tests/tools/manifest/vcs.py

@@ -13,9 +13,13 @@ def is_git_repo(tests_root):
 
 
 _repo_root = None
-def get_repo_root():
+def get_repo_root(initial_dir=None):
     global _repo_root
+
+    if initial_dir is None:
+        initial_dir = os.path.dirname(__file__)
+
     if _repo_root is None:
-        git = get_git_func(os.path.dirname(__file__))
+        git = get_git_func(initial_dir)
         _repo_root = git("rev-parse", "--show-toplevel").rstrip()
     return _repo_root