The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/365ecf30ba17046ff317ff5caf87461ee6187558

commit 365ecf30ba17046ff317ff5caf87461ee6187558
Author: Jian Li <jianli@chromium.org>
Date: Wed Jul 19 20:23:14 2017

[Offline Prefetch] Import the download into offline page model

Move the downloaded archive file from download directory into the
offline pages archive directory and create the metadata record for
it in offline pages metadata database such that it can be opened
as an offline page.

BUG= 738199 
TEST=new tests

Change-Id: I548e3cfe93f962f8533918384e5205e94a55e5bf
Reviewed-on: https://chromium-review.googlesource.com/557159
Commit-Queue: Jian Li <jianli@chromium.org>
Reviewed-by: Dmitry Titov <dimich@chromium.org>
Reviewed-by: Justin DeWitt <dewittj@chromium.org>
Cr-Commit-Position: refs/heads/master@{#487952}
[modify] https://crrev.com/365ecf30ba17046ff317ff5caf87461ee6187558/chrome/browser/BUILD.gn
[add] https://crrev.com/365ecf30ba17046ff317ff5caf87461ee6187558/chrome/browser/offline_pages/prefetch/prefetch_importer_impl.cc
[add] https://crrev.com/365ecf30ba17046ff317ff5caf87461ee6187558/chrome/browser/offline_pages/prefetch/prefetch_importer_impl.h
[modify] https://crrev.com/365ecf30ba17046ff317ff5caf87461ee6187558/chrome/browser/offline_pages/prefetch/prefetch_service_factory.cc
[modify] https://crrev.com/365ecf30ba17046ff317ff5caf87461ee6187558/components/offline_pages/core/offline_page_model.cc
[modify] https://crrev.com/365ecf30ba17046ff317ff5caf87461ee6187558/components/offline_pages/core/offline_page_model.h
[modify] https://crrev.com/365ecf30ba17046ff317ff5caf87461ee6187558/components/offline_pages/core/offline_page_model_impl.cc
[modify] https://crrev.com/365ecf30ba17046ff317ff5caf87461ee6187558/components/offline_pages/core/offline_page_model_impl.h
[modify] https://crrev.com/365ecf30ba17046ff317ff5caf87461ee6187558/components/offline_pages/core/offline_page_model_impl_unittest.cc
[modify] https://crrev.com/365ecf30ba17046ff317ff5caf87461ee6187558/components/offline_pages/core/offline_page_test_store.cc
[modify] https://crrev.com/365ecf30ba17046ff317ff5caf87461ee6187558/components/offline_pages/core/offline_page_types.h
[modify] https://crrev.com/365ecf30ba17046ff317ff5caf87461ee6187558/components/offline_pages/core/prefetch/BUILD.gn
[add] https://crrev.com/365ecf30ba17046ff317ff5caf87461ee6187558/components/offline_pages/core/prefetch/prefetch_importer.h
[modify] https://crrev.com/365ecf30ba17046ff317ff5caf87461ee6187558/components/offline_pages/core/prefetch/prefetch_service.h
[modify] https://crrev.com/365ecf30ba17046ff317ff5caf87461ee6187558/components/offline_pages/core/prefetch/prefetch_service_impl.cc
[modify] https://crrev.com/365ecf30ba17046ff317ff5caf87461ee6187558/components/offline_pages/core/prefetch/prefetch_service_impl.h
[modify] https://crrev.com/365ecf30ba17046ff317ff5caf87461ee6187558/components/offline_pages/core/prefetch/prefetch_service_test_taco.cc
[modify] https://crrev.com/365ecf30ba17046ff317ff5caf87461ee6187558/components/offline_pages/core/prefetch/prefetch_service_test_taco.h
[add] https://crrev.com/365ecf30ba17046ff317ff5caf87461ee6187558/components/offline_pages/core/prefetch/test_prefetch_importer.h
[modify] https://crrev.com/365ecf30ba17046ff317ff5caf87461ee6187558/components/offline_pages/core/stub_offline_page_model.cc
[modify] https://crrev.com/365ecf30ba17046ff317ff5caf87461ee6187558/components/offline_pages/core/stub_offline_page_model.h