Move webkitpy/w3c to blinkpy/w3c.

* Add webkitpy/common/add_blinkpy.py to help blinkpy.w3c dependency from
  webkitpy.

* This CL doesn't sort import directives intentionally because we'll
  change other webkitpy" to "blinkpy" soon.

Change-Id: Ieb2d8617e10b4d8a10136bd7924022a51ee37571
Reviewed-on: https://chromium-review.googlesource.com/1014921
Reviewed-by: Nico Weber <[email protected]>
Reviewed-by: Quinten Yearsley <[email protected]>
Commit-Queue: Kent Tamura <[email protected]>
Cr-Commit-Position: refs/heads/master@{#551919}
diff --git a/third_party/blink/tools/wpt_import.py b/third_party/blink/tools/wpt_import.py
index b833be2..da4c0db 100755
--- a/third_party/blink/tools/wpt_import.py
+++ b/third_party/blink/tools/wpt_import.py
@@ -8,13 +8,10 @@
 import os
 import sys
 
-# Without abspath(), PathFinder can't find chromium_base correctly.
-sys.path.append(os.path.abspath(
-    os.path.join(os.path.dirname(__file__), '..', '..',
-                 'WebKit', 'Tools', 'Scripts')))
+from blinkpy.common import add_webkitpy  # pylint: disable=unused-import
 from webkitpy.common import exit_codes
 from webkitpy.common.host import Host
-from webkitpy.w3c.test_importer import TestImporter
+from blinkpy.w3c.test_importer import TestImporter
 
 
 def main():