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This adds a new PermissionWizard class which currently just shows the
initial dialog, with title, icon, instruction, and Cancel/Launch
buttons. No functionality or logic, except pressing the Cancel button
will hide the window.

Bug: 1015201
Change-Id: I81c4af01435dfa6d2905b5d8e2a7351cd07f97f9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1880175
Commit-Queue: Lambros Lambrou <lambroslambrou@chromium.org>
Reviewed-by: Yuwei Huang <yuweih@chromium.org>
Cr-Commit-Position: refs/heads/master@{#710541}