[Blink] Adding Writing direction to the context menu for Aura.

Chromium side CL is here : https://codereview.chromium.org/83163002/

BUG=91178

Review URL: https://codereview.chromium.org/98453005

git-svn-id: svn://svn.chromium.org/blink/trunk@163321 bbb929c8-8fbe-4397-9dbb-9b2b20218538