Allow InputEvents to propagate w/o IME

If no IME was present, InputEvents such as KeyEvents
would simple be dropped instead of going through
to the Activity's View hierarchy.

Change-Id: I9de25bdbf5d1564b77b25679e19dae18591a8c1c

core/java/android/view/ViewRootImpl.java

@@ -3726,7 +3726,8 @@ public final class ViewRootImpl implements ViewParent,
                     if (result == InputMethodManager.DISPATCH_HANDLED) {
                         return FINISH_HANDLED;
                     } else if (result == InputMethodManager.DISPATCH_NOT_HANDLED) {
-                        return FINISH_NOT_HANDLED;
+                        // The IME could not handle it, so skip along to the next InputStage
+                        return FORWARD;
                     } else {
                         return DEFER; // callback will be invoked later
                     }