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Enhance chrome.app.window API with the possibility of creating a window that
will show up separately in the shelf, tied to its own icon.

Added a new property, showInShelf, to CreateWindowOptions. Default value for
the property is false.

Based on https://codereview.chromium.org/1811523002Co-Authored-By: Paul Sapunaru <paul.sapunaru@intel.com>
Co-Authored-By: Andra Paraschiv <andra.paraschiv@intel.com>

BUG=610299
TEST=interactive_ui_tests
Implement a simple extension that creates windows with the property set
to true. Observe that the newly created windows are added as separate icons in
the shelf.

Review-Url: https://codereview.chromium.org/1914993002
Cr-Commit-Position: refs/heads/master@{#405978}