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When an intent with file:// or content:// URL is opened, a custom
offline header will be set to use the file:// or content:// from this
intent once the validation passes. OfflinePageRequestJob will try to
read from the passing file:// or content:// instead.

Bug: 758690
Change-Id: I69c75a73c02377f62ab0c6f97013be78b149ba7e
Reviewed-on: https://chromium-review.googlesource.com/942466Reviewed-by: Ilya Sherman <isherman@chromium.org>
Reviewed-by: Dmitry Titov <dimich@chromium.org>
Commit-Queue: Jian Li <jianli@chromium.org>
Cr-Commit-Position: refs/heads/master@{#541270}