Updating fast scrollbar UI in Landscape

Creating a separate view for FastScrollBar and moving all the relavant logic in
the view.
For protrait, the touch handling is delegated by the recycler view just like before.
For landscape, the dcrollbar does not overlay with recyclerView and handles the touch
itself

Bug: 37015359
Change-Id: Ie1981326457ba739bdf0ac8063db1065f395f133
diff --git a/res/layout/all_apps.xml b/res/layout/all_apps.xml
index a3c2535..93662fc 100644
--- a/res/layout/all_apps.xml
+++ b/res/layout/all_apps.xml
@@ -16,7 +16,8 @@
 <!-- The top and bottom paddings are defined in this container, but since we want
      the list view to span the full width (for touch interception purposes), we
      will bake the left/right padding into that view's background itself. -->
-<com.android.launcher3.allapps.AllAppsContainerView xmlns:android="http://schemas.android.com/apk/res/android"
+<com.android.launcher3.allapps.AllAppsContainerView
+    xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:launcher="http://schemas.android.com/apk/res-auto"
     android:id="@+id/apps_view"
     android:layout_width="match_parent"
@@ -39,6 +40,8 @@
         android:layout_height="match_parent"
         android:layout_gravity="center"
         android:focusable="true"
+        android:clipToPadding="false"
+        android:clipChildren="true"
         android:focusableInTouchMode="true"
         android:saveEnabled="false"
         android:visibility="gone">
@@ -55,20 +58,14 @@
             android:descendantFocusability="afterDescendants"
             android:focusable="true" />
 
-        <!-- Fast scroller popup -->
-        <TextView
-            style="@style/FastScrollerPopup"
-            android:layout_alignTop="@+id/apps_list_view"
-            android:id="@+id/fast_scroller_popup"
-            android:layout_alignParentEnd="true"
-            android:layout_marginEnd="@dimen/fastscroll_popup_margin" />
-
         <!-- Note: we are reusing/repurposing a system attribute for search layout, because of a
          platform bug, which prevents using custom attributes in <include> tag -->
         <include
             layout="?android:attr/keyboardLayout"
             android:id="@+id/search_container" />
 
+        <include layout="@layout/all_apps_fast_scroller" />
+
     </com.android.launcher3.allapps.AllAppsRecyclerViewContainerView>
     <View
         style="@style/AllAppsNavBarProtection"