Add support for half-opened posture bouncer

This aligns the numbers to the bottom half of the
screen when the device posture is half opened.

Fixes: 328726067
Test: manual - use bouncer on comet
Flag: None
Change-Id: I55bb04fa010958f4b43f0b11cde054eb713b8d39

comet/overlay/frameworks/base/packages/SystemUI/res/values-land/dimens.xml

@@ -0,0 +1,24 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+ * Copyright (c) 2024, 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.
+*/
+-->
+<resources>
+    <!-- Proportion of the screen height to use to set the maximum height of the bouncer to when
+         the device is in the DEVICE_POSTURE_HALF_OPENED posture, for the PIN/pattern entry. 0 will
+         allow it to use the whole screen space, 0.6 will allow it to use just under half of the
+         screen. -->
+    <item name="half_opened_bouncer_height_ratio" type="dimen" format="float">0.6</item>
+</resources>