Adds system service dump for the fullscreen magnification region

Checks if the magnification region is expected for developer.

Bug: 151129165
Test: turn on magnification & adb shell dumpsys window windows
Change-Id: I483353e6ed312aa7451ef3868d6467068891362a
Merged-In: I483353e6ed312aa7451ef3868d6467068891362a
1 file changed