[testing] Use canonicalized selection rather than resulting selection in test result comparison for checking C++ implementation compatibility.
Add checker.sh
[editing] Introduce |getDomSelectionAsChrome()| in |Editor| to use canonicalize selection.
createLink: Insert anchor element for caret as Chrome.
testing: Comment out test expectation for "createLink".
[testing] Use canonicalized selection rather than scripted selection for Chrome compatibility.
Introduce |SelectionTracker.prototype.finishWithStartAsAnchor()| to set start boundary point as selection anchor.
createLink: Utilize |SelectionTracker.prototype.finishWithStartAsAnchor()| for Chrome compatibility.
Editor: Get rid of unused function |getDomSelectionAsChrome()|.
Merge pull request #2 from hajimehoshi-chromium/checker-on-linux

Add checker.sh