代理掉popup的windowmanager，在addView操作，拦截decorView的操作

class WindowManagerProxy implements WindowManager
这个模式的目前不支持监听吧

Start by locating WindowManagerProxy and its addView implementation, then inspect how popup windows and decorView operations are handled. Clarify which decorView operation should be intercepted and what “listening” should expose; done means the requested popup WindowManager behavior is supported and covered by an appropriate test or reproducible verification.

Written by the indexing model from the issue text.