Add a way to get the physical device id of audio devices to core audio.
The purpose of this is to be able to determine when input and audio devices belong to the same physical audio device (e.g. headset, embedded audio device etc).
This will then be used for these cases:
* When we need to select an output device based on a given input device (see bug)
* When the device enumeration APIs are supported, we need to offer this information (or a derived value) to the enumeration API so that web apps can make the same determination.
BUG=276894
Review URL: https://chromiumcodereview.appspot.com/
22877037
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@219036 0039d316-1c4b-4281-b951-d872f2087c98