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The static methods secure and secureServer can be used to start TLS handshake as eihter client or server. This CL only implement the securing of RawSocket. This also changes the semantics of cancelling a subscription on a RawSocket from closing the socket to just pausing. R=ager@google.com BUG=https://code.google.com/p/dart/issues/detail?id=8789 Review URL: https://codereview.chromium.org//13502004 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@21719 260f80e4-7a28-3924-810f-c04153c831b5