tree 141d9aca0dda54a3172139b0ac6e3a888c9e780e
parent 715a2c13e6a010143761c1822ce7c4975921aa0b
author Lloyd Pique <lpique@google.com> 1513300697 -0800
committer Lloyd Pique <lpique@google.com> 1515703495 -0800

Allow a primary display disconnect

This patch forwards the primary display disconnect event to the
Framework, and otherwise ensures that SurfaceFlinger does not crash
while there is no primary display.

Note that the Framework does not yet accept this change. In particular
the ActivityManager ActivityStackSupervisor code promptly asserts that
one cannot remove the primary display. With this assertion disabled, the
framework does not crash (surprisingly). And if the Framework
subsequently receives a primary display connect event, it does not seem
to do anything useful -- the display remains in a default off state, and
no layer stack/viewport/etc is set on it.

Bug: 38464421
Test: Works (with workarounds as noted) on a Chromebook
Test: Added Unit test passes on Pixel 1 XL

Change-Id: Ia11439030efdc53bc17474b71a0ffb3d3085bb49