Add sorting by layout and chat rooms app bar.

app/src/main/res/layout/layout_app_bar_chat_rooms.xml

+<?xml version="1.0" encoding="utf-8"?>
+<com.google.android.material.appbar.AppBarLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content"
+    android:background="@color/colorPrimary"
+    android:theme="@style/Theme.AppCompat.Light.NoActionBar">
+
+    <androidx.appcompat.widget.Toolbar
+        android:id="@+id/toolbar"
+        android:layout_width="match_parent"
+        android:layout_height="?attr/actionBarSize"
+        app:layout_scrollFlags="scroll|enterAlways"
+        app:navigationIcon="?android:attr/homeAsUpIndicator"
+        app:popupTheme="@style/ThemeOverlay.AppCompat.Light"
+        app:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar">
+
+        <TextView
+            android:id="@+id/text_toolbar_title"
+            style="@style/ChatRoom.ChatName.TextView"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            tools:text="Product Team" />
+    </androidx.appcompat.widget.Toolbar>
+
+</com.google.android.material.appbar.AppBarLayout>
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app/src/main/res/layout/layout_sorting_by.xml

+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:orientation="vertical"
+    android:padding="@dimen/screen_edge_left_and_right_margins">
+
+    <TextView
+        android:id="@+id/text_activity"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:drawableStart="@drawable/ic_action_message_star_24dp"
+        android:drawablePadding="16dp"
+        android:text="@string/msg_sort_by_activity" />
+
+    <TextView
+        android:id="@+id/text_name"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:layout_marginTop="16dp"
+        android:drawableStart="@drawable/ic_action_message_star_24dp"
+        android:drawablePadding="16dp"
+        android:text="@string/msg_sort_by_name" />
+
+    <View
+        android:id="@+id/view_divider"
+        android:layout_width="match_parent"
+        android:layout_height="1dp"
+        android:layout_marginTop="16dp"
+        android:background="@color/colorDividerMessageComposer" />
+
+    <TextView
+        android:id="@+id/text_unread_on_top"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:layout_marginTop="16dp"
+        android:drawableStart="@drawable/ic_action_message_star_24dp"
+        android:drawablePadding="16dp"
+        android:text="@string/msg_group_by_unread_on_top" />
+
+    <TextView
+        android:id="@+id/text_group_by_type"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:layout_marginTop="16dp"
+        android:drawableStart="@drawable/ic_action_message_star_24dp"
+        android:drawablePadding="16dp"
+        android:text="@string/msg_group_by_type" />
+
+
+    <TextView
+        android:id="@+id/text_group_by_favorites"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:layout_marginTop="16dp"
+        android:drawableStart="@drawable/ic_action_message_star_24dp"
+        android:drawablePadding="16dp"
+        android:text="@string/msg_group_by_favorites" />
+
+</LinearLayout>
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