Force-set a ClipData to prevent later migration.

migrateExtraStreamToClipData() will only offer to promote Uri values
if a ClipData isn't already defined, so we ensure that a ClipData
value is always defined.  This blocks later promotion and granting.

Bug: 200683077
Bug: 123700107
Test: manual
Change-Id: I99c1411e8b4eb01eb27ac4306e3bf6cc88cb4273
(cherry picked from commit 6ebf410b81)

services/core/java/com/android/server/accounts/AccountManagerService.java

@@ -46,6 +46,7 @@ import android.app.admin.DeviceAdminInfo;
 import android.app.admin.DevicePolicyManager;
 import android.app.admin.DevicePolicyManagerInternal;
 import android.content.BroadcastReceiver;
+import android.content.ClipData;
 import android.content.ComponentName;
 import android.content.Context;
 import android.content.Intent;
@@ -4759,6 +4760,11 @@ public class AccountManagerService
          * supplied entries in the system Settings app.
          */
          protected boolean checkKeyIntent(int authUid, Intent intent) {
+            // Explicitly set an empty ClipData to ensure that we don't offer to
+            // promote any Uris contained inside for granting purposes
+            if (intent.getClipData() == null) {
+                intent.setClipData(ClipData.newPlainText(null, null));
+            }
             intent.setFlags(intent.getFlags() & ~(Intent.FLAG_GRANT_READ_URI_PERMISSION
                     | Intent.FLAG_GRANT_WRITE_URI_PERMISSION
                     | Intent.FLAG_GRANT_PERSISTABLE_URI_PERMISSION