chrome: bluetooth: hook up the AdapterAdded signal
The manager sends signals when additional adapters (including the
initial) are added, we may need these to obtain properties before
the default adapter is switched so hook up that signal so the
observer can take it.
BUG=chromium-os:22086
TEST=verified signals are received
Change-Id: I895c699eaef2f77f70ad855601b16e9a7c731ebb
Review URL: http://codereview.chromium.org/
9302027
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@120024 0039d316-1c4b-4281-b951-d872f2087c98