Destroy the hardware renderer when ViewRootImpl's die is post-poned

Bug #6109035

ViewRootImpl.die() can be invoked in such a way that doDie() will be
executed later. On memory limited device, an eglTerminate() may happen
before doDie() is executed which leads to unstable behaviors. This
change makes sure the renderer is destroyed as soon as possible.

Change-Id: I3322410cdd744b464951e2055aeade6069d1d673