[tool] SpnegoAuth: add multi account, credential confirmation

tools/android/kerberos/SpnegoAuthenticator/res/layout/activity_account_authenticator.xml

Index: tools/android/kerberos/SpnegoAuthenticator/res/layout/activity_account_authenticator.xml
diff --git a/tools/android/kerberos/SpnegoAuthenticator/res/layout/activity_account_authenticator.xml b/tools/android/kerberos/SpnegoAuthenticator/res/layout/activity_account_authenticator.xml
new file mode 100644
index 0000000000000000000000000000000000000000..275384d101e8553eb8dacbbac71fe75fd81ddafb
--- /dev/null
+++ b/tools/android/kerberos/SpnegoAuthenticator/res/layout/activity_account_authenticator.xml
@@ -0,0 +1,53 @@
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+  xmlns:tools="http://schemas.android.com/tools"
+  android:layout_width="match_parent"
+  android:layout_height="match_parent"
+  android:paddingTop="16dp"
+  android:paddingBottom="16dp"
+  android:paddingStart="16dp"
+  android:paddingEnd="16dp"
+  android:gravity="center_horizontal"
+  android:orientation="vertical"
+  android:theme="@android:style/Theme.Material"
+  tools:context=".SpnegoAuthenticatorActivity">
+
+  <ScrollView
+    android:layout_width="match_parent"
+    android:layout_height="match_parent">
+
+    <LinearLayout
+      android:id="@+id/login_form"
+      android:layout_width="match_parent"
+      android:layout_height="wrap_content"
+      android:orientation="vertical">
+
+      <Button
+        android:id="@+id/sign_in_button_1"
+        style="?android:textAppearanceSmall"
+        android:textStyle="bold"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:layout_marginTop="16dp"
+        android:text="@string/action_sign_in_1"/>
+
+      <Button
+        android:id="@+id/sign_in_button_2"
+        style="?android:textAppearanceSmall"
+        android:textStyle="bold"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:layout_marginTop="16dp"
+        android:text="@string/action_sign_in_2"/>
+
+      <Button
+        android:id="@+id/confirm_credentials_button"
+        style="?android:textAppearanceSmall"
+        android:textStyle="bold"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:layout_marginTop="16dp"
+        android:text="@string/action_confirm_credentials"/>
+
+    </LinearLayout>
+  </ScrollView>
+</LinearLayout>