[Trac #1425] Verify that camera activities close the camera device when not in use.

[Zarro Boogs per Child]

#1425: Verify that camera activities close the camera device when not in use.
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  Reporter:  jg      |       Owner:  cjb    
      Type:  task    |      Status:  new    
  Priority:  high    |   Milestone:  BTest-4
 Component:  distro  |     Version:         
Resolution:          |    Keywords:  power  
  Verified:  0       |  
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Comment (by tomeu):

 Yesterday we added an 'active' property to sugar.activity.Activity. The
 shell will set it to True or False when the user switches between
 activites. You can listen to changes on the 'notify::active' signal.

 Is this enough?

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Ticket URL: <http://dev.laptop.org/ticket/1425#comment:4>
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