The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/962421382a640316f648def9d25674bd09b89929

commit 962421382a640316f648def9d25674bd09b89929
Author: Xiangjun Zhang <xjz@chromium.org>
Date: Sat Dec 23 03:51:38 2017

Pass the RemotingStopReason to RendererController.

Currently the RemotingStopReason is not passed to RendererController.
The stop trigger is always ROUTE_TERMINATED if the remoting session is
not stopped from the renderer. This CL converted the RemotingStopReason
to the corresponding StopTrigger so that the stop reason can be
recorded by the UMA stats and also can provide the correct text to be
shown in the toast when switching to mirroring in a coming CL.

Bug:  797176 
Change-Id: Ib4813de4bccbe473e7eca462c422184795b15bb9
Reviewed-on: https://chromium-review.googlesource.com/841665
Reviewed-by: Yuri Wiitala <miu@chromium.org>
Commit-Queue: Xiangjun Zhang <xjz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#526134}
[modify] https://crrev.com/962421382a640316f648def9d25674bd09b89929/media/remoting/remoting_cdm_controller.cc
[modify] https://crrev.com/962421382a640316f648def9d25674bd09b89929/media/remoting/renderer_controller.cc
[modify] https://crrev.com/962421382a640316f648def9d25674bd09b89929/media/remoting/renderer_controller_unittest.cc
[modify] https://crrev.com/962421382a640316f648def9d25674bd09b89929/media/remoting/shared_session.cc
[modify] https://crrev.com/962421382a640316f648def9d25674bd09b89929/media/remoting/shared_session.h
[modify] https://crrev.com/962421382a640316f648def9d25674bd09b89929/media/remoting/triggers.h