If the surface is lost, release it

Bug: 18403246

Surface#isValid() is used throughout ViewRootImpl to
determine Surface validity. However, this will return true
until Surface#release() is called, even if the underlying
BufferQueue is abandoned. We have a very strong signal
from EGL that the Surface is now dead, so use that signal
to call Surface#release() so ViewRootImpl's isValid() usage
will be valid.

Change-Id: Ib355560ef4ca7625c3c784174863d2d55267d93d