[WebsiteSettings] API for permissions bubbles.

This introduces a new API for clients to prepare permission bubbles
for display to the user. Currently Follows the API of the InfoBar system
pretty closely.

BUG=332115

Review URL: https://codereview.chromium.org/121113007

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@245396 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 245396