Fix issue #1983406: Soft keyboard doesn't show up in an EditText with "digits" attribute set

Also pretend to fix #2054990 (com.android.frameworktest: java.lang.NullPointerException
at android.accessibilityservice.AccessibilityService$IEventListenerWrapper.executeMessage(
AccessibilityService.java:215))...  simply by making the variable that apparently was
null final, to assure myself that there is no possible way in the world for it to be
null. :p

Change-Id: I73e337d65b8360721896a0296691257b3e47564b