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Introduces a BookmarkAppInstaller class whose job is to create
a Bookmark App with certain characteristics e.g. name, start url,
launch container, etc.

The BookmarkAppInstaller class uses CrxInstaller to actually
create and install the BookmarkApp. Currently the installer only
takes a WebApplicationInfo but in the future it'll support more
options, for example, if the app will be synced, what container
will the app launch in, etc.

Marks BookmarkAppInstallerTest as a friend in CrxInstaller so that
we can create a fake CrxInstaller that fails to install the app.

Bug: 864904
Change-Id: I105d1e93160f2527ee6cb5c4951fab885a893392
Reviewed-on: https://chromium-review.googlesource.com/1152642
Commit-Queue: Giovanni Ortuño Urquidi <ortuno@chromium.org>
Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Reviewed-by: Dominick Ng <dominickn@chromium.org>
Cr-Commit-Position: refs/heads/master@{#580471}