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When window.open is called, the created app window doesn't know
what url it will be opening, so we can't determine if the toolbar
will be shown. Thus, once the web contents starts a navigation,
the window bounds must be checked for correctness.

This CL adds a property 'initial_url' function to
AppBrowserController. This will be used in a future CL to determine
whether or not to show the 'X' button on the custom tab bar (popups
opened out of scope should not show it).

Before and after screenshots for an in and out of scope popup.
The popups should both have their web contents sized at 480x300

Before: https://bugs.chromium.org/p/chromium/issues/attachment?aid=394814&signed_aid=zqCH2pYzkhISnPQRiPjzuQ==&inline=1
After: https://bugs.chromium.org/p/chromium/issues/attachment?aid=394815&signed_aid=owOrcmaGQWpKcub8E8orNw==&inline=1

Bug: 777854
Change-Id: I893c21d0c13a12b079eb578e68f1167bf335be8e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1626058
Commit-Queue: Jay Harris <harrisjay@chromium.org>
Reviewed-by: Alan Cutter <alancutter@chromium.org>
Reviewed-by: Michael Wasserman <msw@chromium.org>
Cr-Commit-Position: refs/heads/master@{#664129}