Cleanup for theme picker

- Remove the ThemePreviewPage and related layout/dimens.
- Remove the v2 suffix, they are the v1 now.

Test: Build and run successfully
Bug: 151285476
Change-Id: Ie79b8676c3f28cbec77c04db65c16445276a3345
diff --git a/res/layout/theme_preview_card.xml b/res/layout/theme_preview_card.xml
index f80e846..74d1e68 100644
--- a/res/layout/theme_preview_card.xml
+++ b/res/layout/theme_preview_card.xml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <!--
-     Copyright (C) 2019 The Android Open Source Project
+     Copyright (C) 2020 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.
@@ -16,12 +16,24 @@
 -->
 <androidx.cardview.widget.CardView
     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"
-    style="@style/PreviewCard"
+    style="@style/FullContentPreviewCard"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
-    app:contentPadding="0dp">
+    android:layout_gravity="center">
 
-    <include layout="@layout/theme_component_preview"/>
+    <ImageView
+        android:id="@+id/wallpaper_preview_image"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:background="@color/primary_color" />
+
+    <SurfaceView
+        android:id="@+id/wallpaper_preview_surface"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent" />
+
+    <FrameLayout
+        android:id="@+id/theme_preview_container"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"/>
 </androidx.cardview.widget.CardView>
\ No newline at end of file