Dianne Hackborn 1b4447f728 Fix issue #22564918: Request is inactive
Add Request.isActive() API.  Also improve documentation to tell
people what things cause it to become inactive.  And fix a race
where we were modifying the active list from outside the main
thread without locking it.

Change-Id: I9248e014126cb121612edbe595108ace753456e2
2015-07-20 14:49:58 -07:00
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