[ThemePicker 2/N] Add an initial Theme fragment

Initial (mostly empty) implementation of ThemeFragment.
More content to come in follow-up CLs.

Bug: 120559294
Change-Id: Ic763f12cb86945b5af40e14349498660478921a4
diff --git a/res/layout/fragment_theme_picker.xml b/res/layout/fragment_theme_picker.xml
new file mode 100644
index 0000000..d88e1f7
--- /dev/null
+++ b/res/layout/fragment_theme_picker.xml
@@ -0,0 +1,51 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+     Copyright (C) 2018 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.
+-->
+<LinearLayout
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:orientation="vertical"
+    android:background="@color/category_picker_background_color">
+    <include layout="@layout/section_header"/>
+
+    <!-- TODO(santie): Preview pager goes here... -->
+
+    <LinearLayout
+        android:id="@+id/options_section"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:orientation="vertical">
+
+        <androidx.recyclerview.widget.RecyclerView
+            android:id="@+id/options_container"
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content"/>
+
+        <RelativeLayout
+            android:layout_width="match_parent"
+            android:layout_height="wrap_content">
+            <Button
+                style="@style/ActionPrimaryButton"
+                android:layout_width="wrap_content"
+                android:layout_height="wrap_content"
+                android:layout_alignParentEnd="true"
+                android:text="@string/apply_theme_btn"/>
+        </RelativeLayout>
+
+    </LinearLayout>
+
+</LinearLayout>