Default setup wizard to use PIN

- Added "Screen lock options" button in PIN screen, controlled by
  extra EXTRA_SHOW_OPTIONS_BUTTON, which will create a dialog to ask
  the user to choose another screen lock type.
- Extracted ScreenLockType enum and ChooseLockGenericController that
  can be shared by ChooseLockGeneric and the dialog
  ChooseLockTypeDialogFragment.
- The intent extra EXTRA_SHOW_OPTIONS_BUTTON will be set if
  ChooseLockGeneric screen starts ChooseLockPassword /
  ChooseLockPattern without asking the user. (Although the extra is
  ignored by ChooseLockPattern currently)
- Fix layout alignment for the password entry field to remove the
  extra 4dp padding on the sides.

Test: cd tests/robotests && mma
Bug: 35442933
Bug: 38002299
Change-Id: I877fbe08a0c05bb97175e1cbf0260ea6dbda22e2

tests/robotests/src/android/app/admin/PasswordMetrics.java

@@ -0,0 +1,49 @@
+/*
+ * Copyright (C) 2017 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package android.app.admin;
+
+import android.annotation.NonNull;
+
+/**
+ * Stub implementation of framework's PasswordMetrics for Robolectric tests. Otherwise Robolectric
+ * is throwing ClassNotFoundError.
+ *
+ * TODO: Remove this class when Robolectric supports O
+ */
+public class PasswordMetrics {
+
+    // Maximum allowed number of repeated or ordered characters in a sequence before we'll
+    // consider it a complex PIN/password.
+    public static final int MAX_ALLOWED_SEQUENCE = 3;
+
+    public int length = 0;
+    public int letters = 0;
+    public int upperCase = 0;
+    public int lowerCase = 0;
+    public int numeric = 0;
+    public int symbols = 0;
+    public int nonLetter = 0;
+
+    public static int maxLengthSequence(@NonNull String string) {
+        // Stub implementation
+        return 1;
+    }
+
+    public static PasswordMetrics computeForPassword(@NonNull String password) {
+        return new PasswordMetrics();
+    }
+}