Add limited support for new unicode 6.3 control characters

Add the new unicode 6.3 control characters to CharacterNames and add
them to the list of characters that should never be rendered in
GlyphPageTreeNode.

R=jchaffraix@chromium.org

Review URL: https://codereview.chromium.org/599753003

git-svn-id: svn://svn.chromium.org/blink/trunk@182682 bbb929c8-8fbe-4397-9dbb-9b2b20218538