[iOS] Move ReadingListUIDistillationStatus to a separate file.

This is used for both the collection view and table view implementaitons
of the Reading List UI, so needs to be moved to a shared location.

Bug: 805209
Cq-Include-Trybots: luci.chromium.try:ios-simulator-full-configs;master.tryserver.chromium.mac:ios-simulator-cronet
Change-Id: Ia01403e6d318b4ea331ed85ba622c4ce8ce041cf
Reviewed-on: https://chromium-review.googlesource.com/1102119Reviewed-by: Gauthier Ambard <gambard@chromium.org>
Reviewed-by: Sergio Collazos <sczs@chromium.org>
Commit-Queue: Kurt Horimoto <kkhorimoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#570126}

ios/chrome/browser/ui/reading_list/BUILD.gn

@@ -74,6 +74,7 @@ source_set("reading_list_ui") {
     "reading_list_toolbar.mm",
     "reading_list_toolbar_button.h",
     "reading_list_toolbar_button.mm",
+    "reading_list_ui_distillation_status.h",
     "reading_list_view_controller.h",
     "reading_list_view_controller.mm",
     "text_badge_view.h",

ios/chrome/browser/ui/reading_list/reading_list_collection_view_cell.h

@@ -5,16 +5,11 @@
 #ifndef IOS_CHROME_BROWSER_UI_READING_LIST_READING_LIST_COLLECTION_VIEW_CELL_H_
 #define IOS_CHROME_BROWSER_UI_READING_LIST_READING_LIST_COLLECTION_VIEW_CELL_H_
 
+#import "ios/chrome/browser/ui/reading_list/reading_list_ui_distillation_status.h"
 #import "ios/third_party/material_components_ios/src/components/CollectionCells/src/MaterialCollectionCells.h"
 
 @class FaviconViewNew;
 
-typedef NS_ENUM(NSInteger, ReadingListUIDistillationStatus) {
-  ReadingListUIDistillationStatusPending,
-  ReadingListUIDistillationStatusSuccess,
-  ReadingListUIDistillationStatusFailure
-};
-
 // Cell for ReadingListCollectionViewItem.
 @interface ReadingListCell : MDCCollectionViewCell
 

ios/chrome/browser/ui/reading_list/reading_list_ui_distillation_status.h

+// Copyright 2018 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef IOS_CHROME_BROWSER_UI_READING_LIST_READING_LIST_UI_DISTILLATION_STATUS_H_
+#define IOS_CHROME_BROWSER_UI_READING_LIST_READING_LIST_UI_DISTILLATION_STATUS_H_
+
+#import <Foundation/Foundation.h>
+
+// Enum describing the distillation state for reading list UI.
+typedef NS_ENUM(NSInteger, ReadingListUIDistillationStatus) {
+  ReadingListUIDistillationStatusPending,
+  ReadingListUIDistillationStatusSuccess,
+  ReadingListUIDistillationStatusFailure
+};
+
+#endif  // IOS_CHROME_BROWSER_UI_READING_LIST_READING_LIST_UI_DISTILLATION_STATUS_H_