Dispatch from DecorView to View.toString()

Today, the top-level DecorView is missing some useful pieces of data in its dump, for example the "V"isible and "E"nabled and "I"nvalidated and "D"irty flags. Add these back in.

Today it looks like:

```
    View Hierarchy:
      DecorView@41b7f45[MapsActivity]
        android.widget.LinearLayout{a1c3dbb V.E...... ......ID 208,0-1920,1080}
          android.view.ViewStub{c5878e4 G.E...... ......I. 0,0-0,0 #1020194 android:id/action_mode_bar_stub}
```

Note how the DecorView doesn't have the deep debug info the other views do.

This change updates toString to work the same as the other views, but including the extra title suffix information.

This is a new version of aosp/2276228, but on the main branch.

Change-Id: I35415f7625dc99a80412f6656800504eea876d91