Bluetooth: add chrome.bluetooth.getDevice

Add a function for obtaining a Device object for a single device by
address, instead of having to iterate getDevices to look for it.

BUG=352852
TEST=BluetoothApiTest.GetDevice
[email protected], [email protected], [email protected], [email protected]

Review URL: https://codereview.chromium.org/201063002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@257477 0039d316-1c4b-4281-b951-d872f2087c98
7 files changed