Move PreviewPager related code from ThemePicker/ to WallPaperPicker2/.

Since there's a view pager in the new UI design for wallpaper picker.

Bug: 149374062
Test:
. build/envsetup.sh
tapas WallpaperPicker2 (and ThemePicker/WallpaperPickerGoogleDebug/WallpaperPickerGoogleRelease)
make -j40

Change-Id: I78e12419fb7008653db185d1d341e8659a8764de
diff --git a/res/layout/fragment_clock_picker.xml b/res/layout/fragment_clock_picker.xml
index c51b703..6b9f94c 100644
--- a/res/layout/fragment_clock_picker.xml
+++ b/res/layout/fragment_clock_picker.xml
@@ -32,7 +32,7 @@
             android:layout_width="match_parent"
             android:layout_height="match_parent">
 
-            <com.android.customization.widget.PreviewPager
+            <com.android.wallpaper.widget.PreviewPager
                 android:id="@+id/clock_preview_pager"
                 android:layout_width="match_parent"
                 android:layout_height="wrap_content"
diff --git a/res/layout/fragment_clock_scalable_picker.xml b/res/layout/fragment_clock_scalable_picker.xml
index 41ee0f3..db31dc5 100644
--- a/res/layout/fragment_clock_scalable_picker.xml
+++ b/res/layout/fragment_clock_scalable_picker.xml
@@ -29,7 +29,7 @@
         android:layout_height="wrap_content"
         app:layout_behavior="@string/scalable_container_behavior">
 
-        <com.android.customization.widget.PreviewPager
+        <com.android.wallpaper.widget.PreviewPager
             android:id="@+id/clock_preview_pager"
             android:layout_width="match_parent"
             android:layout_height="wrap_content"
diff --git a/res/layout/fragment_grid_picker.xml b/res/layout/fragment_grid_picker.xml
index 099acdf..f664568 100644
--- a/res/layout/fragment_grid_picker.xml
+++ b/res/layout/fragment_grid_picker.xml
@@ -32,7 +32,7 @@
             android:layout_width="match_parent"
             android:layout_height="match_parent">
 
-            <com.android.customization.widget.PreviewPager
+            <com.android.wallpaper.widget.PreviewPager
                 android:id="@+id/grid_preview_pager"
                 android:layout_width="match_parent"
                 android:layout_height="wrap_content"
diff --git a/res/layout/fragment_grid_scalable_picker.xml b/res/layout/fragment_grid_scalable_picker.xml
index 14cd503..de44923 100644
--- a/res/layout/fragment_grid_scalable_picker.xml
+++ b/res/layout/fragment_grid_scalable_picker.xml
@@ -29,7 +29,7 @@
         android:layout_height="wrap_content"
         app:layout_behavior="@string/scalable_container_behavior">
 
-        <com.android.customization.widget.PreviewPager
+        <com.android.wallpaper.widget.PreviewPager
             android:id="@+id/grid_preview_pager"
             android:layout_width="match_parent"
             android:layout_height="wrap_content"
diff --git a/res/layout/fragment_theme_picker.xml b/res/layout/fragment_theme_picker.xml
index 42c9817..1de5a3c 100644
--- a/res/layout/fragment_theme_picker.xml
+++ b/res/layout/fragment_theme_picker.xml
@@ -32,7 +32,7 @@
             android:layout_width="match_parent"
             android:layout_height="match_parent">
 
-            <com.android.customization.widget.PreviewPager
+            <com.android.wallpaper.widget.PreviewPager
                 android:id="@+id/theme_preview_pager"
                 android:layout_width="match_parent"
                 android:layout_height="wrap_content"
diff --git a/res/layout/fragment_theme_scalable_picker.xml b/res/layout/fragment_theme_scalable_picker.xml
index fd5b5b6..e03df3e 100644
--- a/res/layout/fragment_theme_scalable_picker.xml
+++ b/res/layout/fragment_theme_scalable_picker.xml
@@ -29,7 +29,7 @@
         android:layout_height="wrap_content"
         app:layout_behavior="@string/scalable_container_behavior">
 
-        <com.android.customization.widget.PreviewPager
+        <com.android.wallpaper.widget.PreviewPager
             android:id="@+id/theme_preview_pager"
             android:layout_width="match_parent"
             android:layout_height="wrap_content"
diff --git a/res/layout/preview_pager.xml b/res/layout/preview_pager.xml
deleted file mode 100644
index 43f8fb6..0000000
--- a/res/layout/preview_pager.xml
+++ /dev/null
@@ -1,83 +0,0 @@
-<?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"
-    xmlns:tools="http://schemas.android.com/tools"
-    android:layout_width="match_parent"
-    android:layout_height="match_parent"
-    android:orientation="vertical">
-
-    <androidx.viewpager.widget.ViewPager
-        android:id="@+id/preview_viewpager"
-        android:layout_width="match_parent"
-        android:layout_height="0dp"
-        android:layout_weight="1"/>
-
-    <FrameLayout
-        android:id="@+id/indicator_container"
-        android:layout_width="match_parent"
-        android:layout_height="@dimen/indicator_container_height"
-        android:layout_gravity="bottom">
-
-        <com.android.customization.widget.PageIndicator
-            android:id="@+id/page_indicator"
-            android:layout_width="wrap_content"
-            android:layout_height="wrap_content"
-            android:layout_gravity="center" />
-
-        <FrameLayout
-            android:id="@+id/arrow_previous"
-            android:layout_width="@dimen/indicator_arrow_touch_area_size"
-            android:layout_height="@dimen/indicator_arrow_touch_area_size"
-            android:layout_gravity="center_vertical|left"
-            android:layout_marginStart="@dimen/indicator_arrow_container_margin_horizontal"
-            android:background="?android:attr/selectableItemBackgroundBorderless"
-            android:contentDescription="@string/previous_page_content_description"
-            android:visibility="gone"
-            tools:ignore="RtlHardcoded">
-
-            <ImageView
-                android:layout_width="@dimen/indicator_arrow_size"
-                android:layout_height="@dimen/indicator_arrow_size"
-                android:layout_gravity="center"
-                android:contentDescription="@null"
-                android:tint="@color/indicator_arrow_color"
-                android:src="@drawable/ic_arrow_back_24px" />
-        </FrameLayout>
-
-        <FrameLayout
-            android:id="@+id/arrow_next"
-            android:layout_width="@dimen/indicator_arrow_touch_area_size"
-            android:layout_height="@dimen/indicator_arrow_touch_area_size"
-            android:layout_gravity="center_vertical|right"
-            android:layout_marginEnd="@dimen/indicator_arrow_container_margin_horizontal"
-            android:background="?android:attr/selectableItemBackgroundBorderless"
-            android:contentDescription="@string/next_page_content_description"
-            android:visibility="gone"
-            tools:ignore="RtlHardcoded">
-
-            <ImageView
-                android:layout_width="@dimen/indicator_arrow_size"
-                android:layout_height="@dimen/indicator_arrow_size"
-                android:layout_gravity="center"
-                android:contentDescription="@null"
-                android:tint="@color/indicator_arrow_color"
-                android:src="@drawable/ic_arrow_forward_24px" />
-        </FrameLayout>
-    </FrameLayout>
-</LinearLayout>
\ No newline at end of file