Always pass text direction to computePreferredLogicalWidths

Update RenderText to require a text direction when calling RenderText::
computePreferredLogicalWidths. This in turns requires minLogicalWidth
and maxLogicalWidth to require a text direction as well but all
callers already have the direction so passing it along is trivial.

BUG=343535
R=leviw@chromium.org

Review URL: https://codereview.chromium.org/173053003

git-svn-id: svn://svn.chromium.org/blink/trunk@167524 bbb929c8-8fbe-4397-9dbb-9b2b20218538