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If the view of the fragment of a tab is detached from the window (or not
created yet), then mark the WebContents of the tab as hidden. This is to
provide a somewhat reasonable way for the embedder to manipulate the web
hidden state.

Also change newly created TabImpl to be hidden on creation to avoid
unnecessary state flips. This is purely for efficiency, not for
correctness. Left restored tabs alone.

Bug: 1096063
Change-Id: Ie8b5da3bef040536b976435c0507462f7f796c9d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2291691Reviewed-by: Clark DuVall <cduvall@chromium.org>
Commit-Queue: Bo <boliu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#787750}