[FRP] Theme interstitials for lock screen setup

Use the setup wizard theme for EncryptionInterstital and
RedactionInterstitial as they will show during the lock screen setup
as part of setup wizard.

Bug: 18482708
Change-Id: I65c8924952345a4e17fcf4ffb7d68df53244c5d7

src/com/android/settings/ChooseLockGeneric.java

@@ -189,13 +189,13 @@ public class ChooseLockGeneric extends SettingsActivity {
             if (Process.myUserHandle().isOwner() && LockPatternUtils.isDeviceEncryptionEnabled()) {
                 mEncryptionRequestQuality = quality;
                 mEncryptionRequestDisabled = disabled;
+                final Context context = getActivity();
                 // If accessibility is enabled and the user hasn't seen this dialog before, set the
                 // default state to agree with that which is compatible with accessibility
                 // (password not required).
-                final boolean accEn = AccessibilityManager.getInstance(getActivity()).isEnabled();
+                final boolean accEn = AccessibilityManager.getInstance(context).isEnabled();
                 final boolean required = mLockPatternUtils.isCredentialRequiredToDecrypt(!accEn);
-                Intent intent = EncryptionInterstitial.createStartIntent(
-                        getActivity(), quality, required);
+                Intent intent = getEncryptionInterstitialIntent(context, quality, required);
                 startActivityForResult(intent, ENABLE_ENCRYPTION_REQUEST);
             } else {
                 mRequirePassword = false; // device encryption not enabled or not device owner.
@@ -414,6 +414,11 @@ public class ChooseLockGeneric extends SettingsActivity {
                     confirmCredentials);
         }
 
+        protected Intent getEncryptionInterstitialIntent(Context context, int quality,
+                boolean required) {
+            return EncryptionInterstitial.createStartIntent(context, quality, required);
+        }
+
         /**
          * Invokes an activity to change the user's pattern, password or PIN based on given quality
          * and minimum quality specified by DevicePolicyManager. If quality is