This is part 1 of enabling the chooser UIs for Bluetooth from
Apps to enable developers to make a transition.

There are many common functionalities in ChooserBubbleController
that chooser UI needs on both desktops and from Apps. But since
now it is at:
//chrome/browser/ui/website_settings/chooser_bubble_controller.h
code from //extensions can not use it. This patch pulled some
functionalities from ChooserBubbleController and moved it to
ChooserController, which is added to
//components/chooser_controller

BUG=611917, 577170

Review-Url: https://codereview.chromium.org/1984923002
Cr-Commit-Position: refs/heads/master@{#396492}