Propagate setImeWindowStatus() to WMS

setImeWindowStatus() introduced in the previous CL [1] can help
WindowManagerService (WMS) address Bug 34628091.  As a preparation
this CL has InputMethodManagerService propagate relevant information
to WMS WMS for later use.

 [1]: I9921b381e02106dbffff5e0b3d13f0a1245ce807
      db2afde0e584904ee4ce115ce176a4dfe1773990

Test: Verified the callback in WindowManagerService as follows:
       1. Rebuild the system with DEBUG_INPUT_METHOD=true
       2. adb logcat -s WindowManager:*
            to make sure the visibility passed to
            WindowManagerService#updateInputMethodWindowStatus matches
            to the actual IME window visibility
Bug: 34628091
Bug: 35079353
Change-Id: I54fb1faf513883a54293a756e4c9d2ae9453d778