Add mediation for ReadingList distillation state

ios/chrome/browser/ui/reading_list/reading_list_utils.mm

+// Copyright 2017 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.
+
+#import "ios/chrome/browser/ui/reading_list/reading_list_utils.h"
+
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
+ReadingListUIDistillationStatus UIStatusFromModelStatus(
+    ReadingListEntry::DistillationState distillation_state) {
+  switch (distillation_state) {

[lpromero, 2017/03/30 12:58:27]

Nice. So it was not even 1:1 in our use case.

+    case ReadingListEntry::WILL_RETRY:
+    case ReadingListEntry::PROCESSING:
+    case ReadingListEntry::WAITING:
+      return ReadingListUIDistillationStatusPending;
+    case ReadingListEntry::PROCESSED:
+      return ReadingListUIDistillationStatusSuccess;
+    case ReadingListEntry::DISTILLATION_ERROR:
+      return ReadingListUIDistillationStatusFailure;
+  }
+}