Enable new theme picker preveiw

Also add customize button for customize themes.
Screenshot:
    - Portrait: https://screenshot.googleplex.com/HWmnWEACFdW.png
    - Landscape: https://screenshot.googleplex.com/1NcOQNLoLvE.png

Next: cleanup for res/

Test: Manually
Bug: 146475648
Change-Id: I7624f7404949398dee3782317f0ce0ece8194007
diff --git a/res/layout-land/fragment_theme_picker.xml b/res/layout-land/fragment_theme_picker.xml
index dc30232..915fb47 100644
--- a/res/layout-land/fragment_theme_picker.xml
+++ b/res/layout-land/fragment_theme_picker.xml
@@ -31,39 +31,28 @@
             android:layout_height="match_parent"
             android:orientation="horizontal">
 
-            <com.android.wallpaper.widget.PreviewPager
-                android:id="@+id/theme_preview_pager"
+            <FrameLayout
                 android:layout_width="0dp"
                 android:layout_height="match_parent"
-                android:layout_weight="1"
-                android:background="@color/secondary_color"/>
-            <View
-                android:layout_width="1dp"
-                android:layout_height="match_parent"
-                android:background="@color/divider_color"/>
-            <LinearLayout
-                android:id="@+id/options_section"
-                android:layout_width="0dp"
-                android:layout_height="match_parent"
-                android:layout_weight="1"
-                android:paddingVertical="10dp"
-                android:orientation="vertical">
-
-                <androidx.recyclerview.widget.RecyclerView
-                    android:id="@+id/options_container"
+                android:layout_weight="1">
+                <FrameLayout
+                    android:id="@+id/preview_card_container"
                     android:layout_width="match_parent"
-                    android:layout_height="0dp"
-                    android:layout_weight="1"/>
+                    android:layout_height="@dimen/preview_content_height"
+                    android:paddingTop="@dimen/preview_content_padding_top"
+                    android:paddingBottom="@dimen/preview_content_padding_bottom"
+                    android:clipToPadding="false"
+                    android:background="@color/fullscreen_preview_background">
+                    <include layout="@layout/theme_preview_card_v2"/>
+                </FrameLayout>
+            </FrameLayout>
 
-                <Button
-                    android:id="@+id/apply_button"
-                    style="@style/ActionPrimaryButton"
-                    android:layout_width="wrap_content"
-                    android:layout_height="wrap_content"
-                    android:layout_gravity="end"
-                    android:paddingHorizontal="10dp"
-                    android:text="@string/apply_theme_btn"/>
-            </LinearLayout>
+            <androidx.recyclerview.widget.RecyclerView
+                android:id="@+id/options_container"
+                android:layout_width="0dp"
+                android:layout_height="match_parent"
+                android:layout_weight="1"
+                android:paddingVertical="10dp" />
         </LinearLayout>
 
         <androidx.core.widget.ContentLoadingProgressBar
diff --git a/res/layout/fragment_theme_picker.xml b/res/layout/fragment_theme_picker.xml
index 93606ea..704114f 100644
--- a/res/layout/fragment_theme_picker.xml
+++ b/res/layout/fragment_theme_picker.xml
@@ -32,7 +32,6 @@
             android:layout_height="match_parent"
             android:orientation="vertical">
 
-            <!-- The V2 preview card. -->
             <FrameLayout
                 android:id="@+id/preview_card_container"
                 android:layout_width="match_parent"
@@ -40,18 +39,10 @@
                 android:paddingTop="@dimen/preview_content_padding_top"
                 android:paddingBottom="@dimen/preview_content_padding_bottom"
                 android:clipToPadding="false"
-                android:background="@color/fullscreen_preview_background"
-                android:visibility="gone">
+                android:background="@color/fullscreen_preview_background">
                 <include layout="@layout/theme_preview_card_v2"/>
             </FrameLayout>
 
-            <!-- Will remove it later. -->
-            <com.android.wallpaper.widget.PreviewPager
-                android:id="@+id/theme_preview_pager"
-                android:layout_width="match_parent"
-                android:layout_height="@dimen/preview_content_height"
-                android:background="@color/preview_pager_background"/>
-
             <androidx.recyclerview.widget.RecyclerView
                 android:id="@+id/options_container"
                 android:layout_width="match_parent"