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Lots of things want to anchor off the page info icon. E.g.,
permission prompts, the device chooser UI, the first run bubble
and the page info bubble itself.

Unfortunately, the page info bubble is not always present (in
fullscreen for example), and we want to anchor toolkit-views bubbles
off a BrowserView as well as off a BrowserWindowCocoa. So anchoring
is not simple. Currently the logic that deals with this is scattered
around the codebase, and some of it is broken (e.g. crbug/745291).

This CL consolidates the anchoring for permission prompts and the
device chooser UI, for both of their Cocoa and Views versions. The
first run bubble will also use this in a follow-up.

The PageInfo bubble anchoring is a bit simpler since it can't be
shown in fullscreen. It's consolidated partially, but it has some
unnecessary plumbing as well, so more cleanups there are left for
another follow-up).

Bug: 728160, 745291
Change-Id: Id8b3bb9284f8dcc83299aa92123d4ee6e58dddc4
Reviewed-on: https://chromium-review.googlesource.com/575791
Commit-Queue: Trent Apted <tapted@chromium.org>
Reviewed-by: Michael Wasserman <msw@chromium.org>
Cr-Commit-Position: refs/heads/master@{#488494}