The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/a9b5fef167008f5b703468304b2a04a8ba53b53e

commit a9b5fef167008f5b703468304b2a04a8ba53b53e
Author: Thanh Le <thanhdle@chromium.org>
Date: Thu Oct 26 03:09:16 2017

Publish blacklist status on chrome://interventions-internals.

PreviewsBlackList notifies PreviewsIOData on new blacklisted host
and user blacklisted using the observers pattern.

Added functionalities:
- A new tab to track the state of the blacklist on chrome://interventions-internals.
- A table of blacklisted hosts with the blacklisted times are displayed on the new tab.
- New blacklisted hosts are posted to this tab by listening to PreviewsBlackList.
- User blacklisted state is also being tracked with the blacklisted time.
- When the blacklist is cleared (e.g. By clearing browsing history) all blacklist on the UI is removed.
- The last blacklist cleared status is also being tracked.

Event in blacklist is pushed to the internal page when new events
happen in PreviewsBlacklist. The observers remove themselves from the observers list when
they are being destroyed. This is similar to the pattern used in
publishing new event log to chrome://interventions-internals
(https://chromium-review.googlesource.com/c/chromium/src/+/698887).

Bug:  764416 
Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
Change-Id: I7d2be7031f7d7690838c09bbbdfc65e34a78aa82
Reviewed-on: https://chromium-review.googlesource.com/726520
Commit-Queue: Thanh Le <thanhdle@chromium.org>
Reviewed-by: Emily Stark <estark@chromium.org>
Reviewed-by: Ryan Sturm <ryansturm@chromium.org>
Reviewed-by: Tarun Bansal <tbansal@chromium.org>
Cr-Commit-Position: refs/heads/master@{#511717}
[modify] https://crrev.com/a9b5fef167008f5b703468304b2a04a8ba53b53e/chrome/browser/resources/interventions_internals/index.css
[modify] https://crrev.com/a9b5fef167008f5b703468304b2a04a8ba53b53e/chrome/browser/resources/interventions_internals/index.html
[modify] https://crrev.com/a9b5fef167008f5b703468304b2a04a8ba53b53e/chrome/browser/resources/interventions_internals/index.js
[modify] https://crrev.com/a9b5fef167008f5b703468304b2a04a8ba53b53e/chrome/browser/ui/webui/interventions_internals/interventions_internals.mojom
[modify] https://crrev.com/a9b5fef167008f5b703468304b2a04a8ba53b53e/chrome/browser/ui/webui/interventions_internals/interventions_internals_page_handler.cc
[modify] https://crrev.com/a9b5fef167008f5b703468304b2a04a8ba53b53e/chrome/browser/ui/webui/interventions_internals/interventions_internals_page_handler.h
[modify] https://crrev.com/a9b5fef167008f5b703468304b2a04a8ba53b53e/chrome/browser/ui/webui/interventions_internals/interventions_internals_page_handler_unittest.cc
[modify] https://crrev.com/a9b5fef167008f5b703468304b2a04a8ba53b53e/chrome/test/data/webui/interventions_internals_browsertest.js
[modify] https://crrev.com/a9b5fef167008f5b703468304b2a04a8ba53b53e/components/previews/core/previews_black_list.cc
[modify] https://crrev.com/a9b5fef167008f5b703468304b2a04a8ba53b53e/components/previews/core/previews_black_list.h
[add] https://crrev.com/a9b5fef167008f5b703468304b2a04a8ba53b53e/components/previews/core/previews_black_list_delegate.h
[modify] https://crrev.com/a9b5fef167008f5b703468304b2a04a8ba53b53e/components/previews/core/previews_black_list_unittest.cc
[modify] https://crrev.com/a9b5fef167008f5b703468304b2a04a8ba53b53e/components/previews/core/previews_io_data.cc
[modify] https://crrev.com/a9b5fef167008f5b703468304b2a04a8ba53b53e/components/previews/core/previews_io_data.h
[modify] https://crrev.com/a9b5fef167008f5b703468304b2a04a8ba53b53e/components/previews/core/previews_io_data_unittest.cc
[modify] https://crrev.com/a9b5fef167008f5b703468304b2a04a8ba53b53e/components/previews/core/previews_logger.cc
[modify] https://crrev.com/a9b5fef167008f5b703468304b2a04a8ba53b53e/components/previews/core/previews_logger.h
[modify] https://crrev.com/a9b5fef167008f5b703468304b2a04a8ba53b53e/components/previews/core/previews_logger_observer.h
[modify] https://crrev.com/a9b5fef167008f5b703468304b2a04a8ba53b53e/components/previews/core/previews_logger_unittest.cc
[modify] https://crrev.com/a9b5fef167008f5b703468304b2a04a8ba53b53e/components/previews/core/previews_ui_service.cc
[modify] https://crrev.com/a9b5fef167008f5b703468304b2a04a8ba53b53e/components/previews/core/previews_ui_service.h
[modify] https://crrev.com/a9b5fef167008f5b703468304b2a04a8ba53b53e/components/previews/core/previews_ui_service_unittest.cc