Correct debugging of accountsForUser binder cache

Bug: 140788621

Replaced the default result comparison so that two results can be compared
for value equality.  This code is only exercised with VERIFY is set true
in PropertyInvalidatedCache (this is a compile-time flag).

Test: Created a special build that sets VERIFY to true; verified that the
binder cache does not detect any inconsistent results.  Further modified
the build to generate inconsistencies; verified that the new code does,
in fact, detect true inconsistencies.

Change-Id: I48080cd3109b96159f711bd2d84a69530450c2c8

core/java/android/accounts/AccountManager.java

@@ -388,6 +388,16 @@ public class AccountManager {
                 throw e.rethrowFromSystemServer();
             }
         }
+        @Override
+        protected boolean debugCompareQueryResults(Account[] l, Account[] r) {
+            if (l == r) {
+                return true;
+            } else if (l == null || r == null) {
+                return false;
+            } else {
+                return Arrays.equals(l, r);
+            }
+        }
     };
 
     /**