Parser: Don't wrap <style> or <link> tags in paragraphs

Parser: Don't wrap <style> or <link> tags in paragraphs

If <style> or <link> tags are by themselves on a line, don't wrap them
in <p> tags. But, at the same time, don't end an existing paragraph if
we find <style> or <link> in the middle (like we would if we just
treated them as block tags).

If <style> or <link> is on a line with other text, though, let it be
wrapped in a paragraph along with that other text.

Bug: T186965
Change-Id: Ide4005842cdab537226aa538cb5f7d8e363ba95d