Update colors in pin widget dialog, to be similar to widget bottom sheet.

Bug: 187374499
Test: Visually tested. Also tested using accessibility scanner.
Change-Id: I3be84dc394d312d03b97fe66b7e8214c4d8bef71
diff --git a/res/drawable/add_item_dialog_background.xml b/res/drawable/add_item_dialog_background.xml
index 04bde8f..16a0767 100644
--- a/res/drawable/add_item_dialog_background.xml
+++ b/res/drawable/add_item_dialog_background.xml
@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <shape xmlns:android="http://schemas.android.com/apk/res/android"
     android:shape="rectangle" >
-    <solid android:color="?android:attr/colorBackground" />
+    <solid android:color="@color/widgets_picker_surface" />
     <corners
         android:topLeftRadius="?android:attr/dialogCornerRadius"
         android:topRightRadius="?android:attr/dialogCornerRadius" />
diff --git a/res/layout/add_item_confirmation_activity.xml b/res/layout/add_item_confirmation_activity.xml
index 7c2f25b..00d148f 100644
--- a/res/layout/add_item_confirmation_activity.xml
+++ b/res/layout/add_item_confirmation_activity.xml
@@ -21,6 +21,7 @@
     android:layout_width="match_parent"
     android:layout_height="match_parent"
     android:padding="24dp"
+    android:theme="?attr/widgetsTheme"
     android:orientation="vertical">
 
     <TextView
@@ -43,6 +44,8 @@
         android:paddingVertical="8dp"
         android:text="@string/add_item_request_drag_hint"
         android:textSize="14sp"
+        android:textColor="?android:attr/textColorSecondary"
+        android:alpha="0.7"
         android:importantForAccessibility="no"/>
 
     <include layout="@layout/widget_cell"