Update buttons in FP find sensor

Remove the next button (so the user has to touch the sensor to
proceed), and add a skip button.

Test: cd tests/robotests && mma
Bug: 62839648
Change-Id: I555948ac2f3235e08b91f0957aa8e0ce24535c08

res/layout/fingerprint_enroll_find_sensor_base.xml

@@ -17,10 +17,12 @@
 
 <com.android.setupwizardlib.GlifLayout
     xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
     android:id="@+id/setup_wizard_layout"
     style="?attr/fingerprint_layout_theme"
     android:layout_width="match_parent"
-    android:layout_height="match_parent">
+    android:layout_height="match_parent"
+    app:suwFooter="@layout/fingerprint_enroll_find_sensor_base_footer">
 
     <FrameLayout
         android:layout_width="match_parent"
@@ -56,7 +58,7 @@
                 android:layout_weight="1"/>
 
             <Button
-                style="@style/SuwGlifButton.Primary"
+                style="@style/SuwGlifButton.Secondary"
                 android:id="@+id/next_button"
                 android:layout_width="wrap_content"
                 android:layout_height="wrap_content"

res/layout/fingerprint_enroll_find_sensor_base_footer.xml

@@ -0,0 +1,31 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+    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.
+-->
+
+<!-- TODO: Use aapt:attr when it is fixed (b/36809755) -->
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    style="@style/SuwGlifButtonBar"
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content">
+
+    <Button
+        style="@style/SuwGlifButton.Secondary"
+        android:id="@+id/skip_button"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="@string/skip_label" />
+
+</LinearLayout>