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SignedExchangeDevToolsProxy sends the SignedExchangeHeader and the certificate
information and the error messages to DevTools.
When the user clicks a signed exchange response in Network panel, these
information will be displayed in the Preview panel.

And the network grid view will show “from SignedExchange” in the size column of
the content of the signed exchange like “from disk cache”.

See the doc for more details: https://bit.ly/2HXVbCU

This CL depends on https://crrev.com/c/1029755

Bug: 830505
Change-Id: Ice3743f2e1675b6d604eeaba731ebd8494c2b5a1
Reviewed-on: https://chromium-review.googlesource.com/1004890Reviewed-by: Dmitry Gozman <dgozman@chromium.org>
Reviewed-by: Kunihiko Sakamoto <ksakamoto@chromium.org>
Commit-Queue: Tsuyoshi Horo <horo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#559363}