Support direction aware properties in the jinja2-based StyleBuilder

This patch adds support in the jinja2-based StyleBuilder for direction
aware properties. These are vendor-specific properties which map to
regular properties based on text direction and block flow direction.

BUG=237400

Review URL: https://codereview.chromium.org/272093002

git-svn-id: svn://svn.chromium.org/blink/trunk@173902 bbb929c8-8fbe-4397-9dbb-9b2b20218538