Changes to the canonical are only addition of a comment header and path-setting lines:
```
chrome_src = os.path.abspath(os.path.join(script_dir, os.pardir))
SRC_DIR = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
sys.path.insert(0, os.path.join(chrome_src, 'tools'))
```
Change-Id: I403c1d7dd56cc45fcddd93142e8929e8cd5ae75f
Reviewed-on: https://dart-review.googlesource.com/76705
Reviewed-by: Zach Anderson <zra@google.com>
Commit-Queue: Alexander Aprelev <aam@google.com>