Save favicon during reading list distillation

components/dom_distiller/ios/favicon_web_state_dispatcher.h

+// Copyright 2016 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 COMPONENTS_DOM_DISTILLER_IOS_FAVICON_WEB_STATE_DISPATCHER_H_
+#define COMPONENTS_DOM_DISTILLER_IOS_FAVICON_WEB_STATE_DISPATCHER_H_
+
+namespace web {
+class WebState;
+}
+
+namespace dom_distiller {
+
+// Dispatcher for WebState havind a Favicon Driver, with BookmarkModel and
+// HistoryService attached, as observer. The Webstate are kept alive between
+// their creation and their return. After a WebState is returned, the dispatcher
+// keeps it alive long enough for it to download the favicons.
+class FaviconWebStateDispatcher {
+ public:
+  FaviconWebStateDispatcher() {}
+  virtual ~FaviconWebStateDispatcher() {}
+  // Returns a WebState with a Favicon Driver attached.
+  virtual web::WebState* RequestWebState() = 0;
+  // Called to return a WebState. The WebState should not be used after being
+  // returned.
+  virtual void ReturnWebState(web::WebState* web_state) = 0;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(FaviconWebStateDispatcher);
+};
+
+}  // namespace dom_distiller
+
+#endif  // COMPONENTS_DOM_DISTILLER_IOS_FAVICON_WEB_STATE_DISPATCHER_H_