[precise] SRU: LP1007575 USB Headset interferes with mouse function

[Dave Chiluk]

SRU Justification:
Impact:

 * Plugging in a SB Arena USB headset or a number of other usb
   headsets causes the current window to hold focus, and prevent other
   windows from being selected essentially making the desktop unusable.

 * Without this patch users are forced to not use these devices.

Fix:
 * cherry picked from upstream commit
   929578ab0339fe42bb3ceeaa2e6607189cddf70b
 * This fix was arrived at via bisection, and has been verified in
   LP1080882
 * Fixes the button mappings for the volume control which shows up as a
   hid device which is attached to the headset.

Testcase:

 * Create 2 windows
 * With focus set on one of them
 * Plug in the headset
 * Attempt to change focus using the mouse to the other window.
 * User will not be able to select focus on the other window.


Patches for Quantal and Precise attached.


Dave.


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