Remove gap between popup items

- Unround interior corners
- Update colors (shortcuts are gray when next to
  notifications, notifications always white)
- Clean up animation to animate entire popup with
  simple reveal instead of individual items
  animating with reveal and icon scale

Bug: 35766387
Bug: 36110804
Change-Id: I33685d53e2db3904731676123dc230be4dabb5d4
diff --git a/res/layout/horizontal_divider.xml b/res/layout/horizontal_divider.xml
new file mode 100644
index 0000000..33773eb
--- /dev/null
+++ b/res/layout/horizontal_divider.xml
@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<View xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="@dimen/popup_item_divider_height"
+    android:background="?android:attr/listDivider"/>
\ No newline at end of file
diff --git a/res/layout/notification.xml b/res/layout/notification.xml
index f955c6b..a03dd08 100644
--- a/res/layout/notification.xml
+++ b/res/layout/notification.xml
@@ -19,9 +19,7 @@
     android:id="@+id/notification_view"
     android:layout_width="@dimen/bg_popup_item_width"
     android:layout_height="wrap_content"
-    android:elevation="@dimen/deep_shortcuts_elevation"
-    android:background="@drawable/bg_white_round_rect"
-    android:backgroundTint="@color/notification_color_beneath">
+    android:elevation="@dimen/deep_shortcuts_elevation">
 
     <RelativeLayout
         android:layout_width="match_parent"
@@ -35,7 +33,7 @@
             android:layout_height="@dimen/notification_header_height"
             android:paddingStart="@dimen/notification_padding_start"
             android:paddingEnd="@dimen/notification_padding_end"
-            android:background="@color/popup_header_background_color"
+            android:background="@color/popup_background_color"
             android:elevation="@dimen/notification_elevation">
             <TextView
                 android:id="@+id/notification_text"
diff --git a/res/layout/shortcuts_item.xml b/res/layout/shortcuts_item.xml
index 8b20bcb..e54462e 100644
--- a/res/layout/shortcuts_item.xml
+++ b/res/layout/shortcuts_item.xml
@@ -19,8 +19,7 @@
     android:id="@+id/shortcuts_view"
     android:layout_width="@dimen/bg_popup_item_width"
     android:layout_height="wrap_content"
-    android:elevation="@dimen/deep_shortcuts_elevation"
-    android:background="@drawable/bg_white_round_rect">
+    android:elevation="@dimen/deep_shortcuts_elevation">
 
     <LinearLayout
         android:id="@+id/deep_shortcuts"