Fix DPM.getPermissionGrantState()

The recent addition of DPM API access delegation introduced a bug in
this method. When a system app (UID 1000) called the method, it would
crash.

Bug: 34760123
Test: DPM unit tests
Change-Id: I69390ca30270d64a4d28a74c13a7679f14a62959
diff --git a/services/tests/servicestests/src/com/android/server/devicepolicy/DevicePolicyManagerTest.java b/services/tests/servicestests/src/com/android/server/devicepolicy/DevicePolicyManagerTest.java
index c29668f..f4e4e08 100644
--- a/services/tests/servicestests/src/com/android/server/devicepolicy/DevicePolicyManagerTest.java
+++ b/services/tests/servicestests/src/com/android/server/devicepolicy/DevicePolicyManagerTest.java
@@ -3575,20 +3575,24 @@
 
         // System can retrieve permission grant state.
         mContext.binder.callingUid = DpmMockContext.SYSTEM_UID;
+        mContext.packageName = "com.example.system";
         assertEquals(DevicePolicyManager.PERMISSION_GRANT_STATE_GRANTED,
                 dpm.getPermissionGrantState(null, app1, permission));
         assertEquals(DevicePolicyManager.PERMISSION_GRANT_STATE_DEFAULT,
                 dpm.getPermissionGrantState(null, app2, permission));
 
         // A regular app cannot retrieve permission grant state.
-        mMockContext.binder.callingUid = DpmMockContext.CALLER_UID;
+        mContext.binder.callingUid = setupPackageInPackageManager(app1, 1);
+        mContext.packageName = app1;
         try {
             dpm.getPermissionGrantState(null, app1, permission);
-            fail("Didn't throw IllegalStateException");
-        } catch (IllegalStateException expected) {
+            fail("Didn't throw SecurityException");
+        } catch (SecurityException expected) {
         }
 
         // Profile owner can retrieve permission grant state.
+        mContext.binder.callingUid = DpmMockContext.CALLER_UID;
+        mContext.packageName = admin1.getPackageName();
         setAsProfileOwner(admin1);
         assertEquals(DevicePolicyManager.PERMISSION_GRANT_STATE_GRANTED,
                 dpm.getPermissionGrantState(admin1, app1, permission));