[cr] Integrated: Add viewport meta tag

[Erik Helin]

Hi all,

please review this small patch that adds a `<meta>` tag for `viewport`.

Thanks,
Erik

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Commit messages:
 - Add viewport meta tag

Changes: https://git.openjdk.java.net/cr/pull/7/files
 Webrev: https://webrevs.openjdk.java.net/?repo=cr&pr=7&range=00
  Stats: 1 line in 1 file changed: 1 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/cr/pull/7.diff
  Fetch: git fetch https://git.openjdk.java.net/cr pull/7/head:pull/7

PR: https://git.openjdk.java.net/cr/pull/7