Make mutable PendingIntent explicit

Starting from target SDK U, we will block creation of mutable
PendingIntents with implicit Intents because attackers can mutate the
Intent object within and launch altered behavior on behalf of victim
apps. For more details on the vulnerability, see go/pendingintent-rca.

From a quick analysis, we concluded that the PendingIntent here was only
destined to the test app/to the app, so it was made explicit. Reviewers,
please call out if this is not the case.

Bug: 236704164
Bug: 229362273
Test: TH passes
Change-Id: I55f4cbf3824b988a164fb7087e99007f3d551833

libs/usb/tests/AccessoryChat/src/com/android/accessorychat/AccessoryChat.java

@@ -83,7 +83,9 @@ public class AccessoryChat extends Activity implements Runnable, TextView.OnEdit
         super.onCreate(savedInstanceState);
 
         mUsbManager = (UsbManager) getSystemService(Context.USB_SERVICE);
-        mPermissionIntent = PendingIntent.getBroadcast(this, 0, new Intent(ACTION_USB_PERMISSION), PendingIntent.FLAG_MUTABLE_UNAUDITED);
+        mPermissionIntent = PendingIntent.getBroadcast(this, 0,
+                new Intent(ACTION_USB_PERMISSION).setPackage(this.getPackageName()),
+                PendingIntent.FLAG_MUTABLE);
         IntentFilter filter = new IntentFilter(ACTION_USB_PERMISSION);
         registerReceiver(mUsbReceiver, filter);
 

tests/RollbackTest/SampleRollbackApp/src/com/android/sample/rollbackapp/MainActivity.java

@@ -89,6 +89,7 @@ public class MainActivity extends Activity {
             for (int i = 0; i < mIdsToRollback.size(); i++) {
                 Intent intent = new Intent(ACTION_NAME);
                 intent.putExtra(ROLLBACK_ID_EXTRA, mIdsToRollback.get(i));
+                intent.setPackage(getApplicationContext().getPackageName());
                 PendingIntent pendingIntent = PendingIntent.getBroadcast(
                         getApplicationContext(), 0, intent, FLAG_MUTABLE);
                 mRollbackManager.commitRollback(mIdsToRollback.get(i),