multiple-desktops: Add new desktop button xml file

- Add the skeleton xml file for the new desktop button
- Add the icon for this button as well
- Create the kotlin file for this button

Flag: EXEMPT as added files haven't connected with the production logic
Fix: 379941322
Test: None
Change-Id: I5c7ea2c061f0f9539483221f40c892626103d11e
diff --git a/quickstep/res/layout/overview_add_desktop_button.xml b/quickstep/res/layout/overview_add_desktop_button.xml
new file mode 100644
index 0000000..2333dd1
--- /dev/null
+++ b/quickstep/res/layout/overview_add_desktop_button.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.
+-->
+<com.android.quickstep.views.AddDesktopButton
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:launcher="http://schemas.android.com/apgk/res-auto"
+    android:id="@+id/add_desktop_button"
+    android:layout_width="wrap_content"
+    android:layout_height="wrap_content"
+    android:src="@drawable/ic_desktop_add"
+    android:padding="10dp" />
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diff --git a/quickstep/src/com/android/quickstep/views/AddDesktopButton.kt b/quickstep/src/com/android/quickstep/views/AddDesktopButton.kt
new file mode 100644
index 0000000..f973dd0
--- /dev/null
+++ b/quickstep/src/com/android/quickstep/views/AddDesktopButton.kt
@@ -0,0 +1,30 @@
+/*
+ * 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.
+ */
+
+package com.android.quickstep.views
+
+import android.content.Context
+import android.util.AttributeSet
+import android.widget.ImageButton
+
+/**
+ * Button for supporting multiple desktop sessions. The button will be next to the first TaskView
+ * inside overview, while clicking this button will create a new desktop session.
+ */
+class AddDesktopButton @JvmOverloads constructor(context: Context, attrs: AttributeSet? = null) :
+    ImageButton(context, attrs) {
+    // TODO(b/382057498): add this button the overview.
+}
diff --git a/res/drawable/ic_desktop_add.xml b/res/drawable/ic_desktop_add.xml
new file mode 100644
index 0000000..fa5e0de
--- /dev/null
+++ b/res/drawable/ic_desktop_add.xml
@@ -0,0 +1,24 @@
+<!--
+  ~ 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.
+  -->
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="48dp"
+    android:height="48dp"
+    android:viewportWidth="960"
+    android:viewportHeight="960">
+    <path
+        android:pathData="M140,740v-520,520ZM240,640v-200h360v200L240,640ZM140,800q-24,0 -42,-18t-18,-42v-520q0,-24 18,-42t42,-18h680q24,0 42,18t18,42v300h-60v-300L140,220v520h420v60L140,800ZM680,520v-160L360,360v-40h360v200h-40ZM740,880v-120L620,760v-60h120v-120h60v120h120v60L800,760v120h-60Z"
+        android:fillColor="#5f6368"/>
+</vector>
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