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Group navigation logs with the corresponding decisions message of the
navigation.

Push the group message to the top of the table when there's a new message in
that group. Since navigation logs could be called called much later compared to
decision logs, the message group need to float to the top of the table when new
messages are added to the group.

Bug: 791778
Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
Change-Id: Ic872fd155ca25a35286bafaaffde41c2b65a01d4
Reviewed-on: https://chromium-review.googlesource.com/809936
Commit-Queue: Thanh Le <thanhdle@chromium.org>
Reviewed-by: Ryan Sturm <ryansturm@chromium.org>
Reviewed-by: Tarun Bansal <tbansal@chromium.org>
Cr-Commit-Position: refs/heads/master@{#522230}