Complete doDie() before executing addView().

If WindowManager.addView() is called soon after
WindowManager.removeView() then the MSG_DIE in the ViewRootImpl
mHandler queue may not have had time to execute. This will cause
WindowManagerGlobal to throw an exception since the DecorView
is being added before it has been removed.

This fix detects that situation by saving all Views that are queued
up for ViewRootImpl.doDie(). If addView() is called for one of these
Views then doDie() is called immediately and not called when MSG_DIE
eventually makes its way through the queue.

This change also makes doDie() non-reentrant by only allowing it to
carry out its functions the first time it is called. This keeps
dispatchDetachedWindows() from causing destruction by recursively
calling back into doDie(). This is usually caused by calling
dismissDialog() from within dispatchDetachedWindow().

Fixes bug 9404689.
Fixes bug 9406261.

Change-Id: Id4fc8054e273215d82366428fef51b9ba98385fe