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The Feed provides information about articles that the offline host must
pass along to Prefetch. However this is instigated by Prefetch from
native and is async, which causes some problems. In order to convert a
list of objects across the JNI, state is held in the FeedOfflineBridge
inside a vector. In order to strongly own the callback to Prefetch, it
is stored in the FeedOfflineHost, which guarantees Prefetch is still
alive. While at it we added a vector of pending callbacks for known
content which may be used one day by internals page for Feed.

This code is not actually invoked yet the FeedOfflineHost does
not yet provide itself to Prefetch.

Bug: 866123
Change-Id: Ie4cf9597d9fcaa47baadff060001974fa1375e6b
Reviewed-on: https://chromium-review.googlesource.com/1219937
Commit-Queue: Sky Malice <skym@chromium.org>
Reviewed-by: Filip Gorski <fgorski@chromium.org>
Reviewed-by: Gang Wu <gangwu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#591222}