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Implements migration of a QUIC connection to a different destination address if specified by the server in an ASAD tag in the Server Hello. Quietly falls back to original socket if creation and connecting a new socket fails.

R=rch@chromium.org
BUG=

Review-Url: https://codereview.chromium.org/2124753005
Cr-Commit-Position: refs/heads/master@{#405262}