Call callback in IDLE state

In current state, if you want to do something with the capturer (eg. switch to next camera again) it fails with an exception that camera switch is already in progress.

Change-Id: I908eb590b54fdf3346441097b39f1f2a2eb56ce8

Bug: webrtc:9527
Change-Id: I908eb590b54fdf3346441097b39f1f2a2eb56ce8
Reviewed-on: https://webrtc-review.googlesource.com/88700
Commit-Queue: Sami Kalliomäki <sakal@webrtc.org>
Reviewed-by: Sami Kalliomäki <sakal@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#23995}
diff --git a/AUTHORS b/AUTHORS
index 2b09878..af1688f 100644
--- a/AUTHORS
+++ b/AUTHORS
@@ -24,6 +24,7 @@
 Hugues Ekra <hekra01@gmail.com>
 Jake Hilton <jakehilton@gmail.com>
 James H. Brown <jbrown@burgoyne.com>
+Jan Kalab <pitlicek@gmail.com>
 Jens Nielsen <jens.nielsen@berotec.se>
 Jiawei Ou <jiawei.ou@gmail.com>
 Jie Mao <maojie0924@gmail.com>