Use the new INSTALL_FROM_ADB Package Manager flag...

...when installing an apk in the course of an 'adb restore' operation.

Fixes bug 5374597.

Change-Id: I8ddce0e015e3bab79432e82709d841887667c346

services/java/com/android/server/BackupManagerService.java

@@ -3380,7 +3380,8 @@ class BackupManagerService extends IBackupManager.Stub {
                 Uri packageUri = Uri.fromFile(apkFile);
                 mInstallObserver.reset();
                 mPackageManager.installPackage(packageUri, mInstallObserver,
-                        PackageManager.INSTALL_REPLACE_EXISTING, installerPackage);
+                        PackageManager.INSTALL_REPLACE_EXISTING | PackageManager.INSTALL_FROM_ADB,
+                        installerPackage);
                 mInstallObserver.waitForCompletion();
 
                 if (mInstallObserver.getResult() != PackageManager.INSTALL_SUCCEEDED) {