Read theme for lock screen flows

Move the applyThemeResource calls up from the setup wizard specific
subclasses up to the settings classes so that it will get GLIF v2
theme on devices that request it.

Test: Manual
Bug: 62906814
Change-Id: I6ff4ff8d9ed3e6090b35b4ae7197e5d01f5a61f8

src/com/android/settings/EncryptionInterstitial.java

@@ -24,6 +24,7 @@ import android.app.admin.DevicePolicyManager;
 import android.content.Context;
 import android.content.DialogInterface;
 import android.content.Intent;
+import android.content.res.Resources;
 import android.os.Bundle;
 import android.util.Log;
 import android.view.LayoutInflater;
@@ -56,6 +57,12 @@ public class EncryptionInterstitial extends SettingsActivity {
         return modIntent;
     }
 
+    @Override
+    protected void onApplyThemeResource(Resources.Theme theme, int resid, boolean first) {
+        resid = SetupWizardUtils.getTheme(getIntent());
+        super.onApplyThemeResource(theme, resid, first);
+    }
+
     @Override
     protected boolean isValidFragment(String fragmentName) {
         return EncryptionInterstitialFragment.class.getName().equals(fragmentName);