Adding support for overriding hotseat Widget

Bug: 131360075
Change-Id: I94151cb2987d7decea283790ab9e87cb4627d40c

res/layout/hotseat.xml

@@ -0,0 +1,24 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (C) 2019 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.launcher3.Hotseat
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:launcher="http://schemas.android.com/apk/res-auto"
+    android:id="@+id/hotseat"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:theme="@style/HomeScreenElementTheme"
+    android:importantForAccessibility="no"
+    launcher:containerType="hotseat" />

res/layout/launcher.xml

@@ -39,13 +39,9 @@
             launcher:pageIndicator="@+id/page_indicator" />
 
         <!-- DO NOT CHANGE THE ID -->
-        <com.android.launcher3.Hotseat
+        <include
             android:id="@+id/hotseat"
-            android:layout_width="match_parent"
-            android:layout_height="match_parent"
-            android:theme="@style/HomeScreenElementTheme"
-            android:importantForAccessibility="no"
-            launcher:containerType="hotseat" />
+            layout="@layout/hotseat" />
 
         <include
             android:id="@+id/overview_panel"