Componentize FaviconTabHelper

components/favicon/ios/web_favicon_driver.h

Index: components/favicon/ios/web_favicon_driver.h
diff --git a/components/favicon/ios/web_favicon_driver.h b/components/favicon/ios/web_favicon_driver.h
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+// Copyright 2015 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_FAVICON_IOS_WEB_FAVICON_DRIVER_H_
+#define COMPONENTS_FAVICON_IOS_WEB_FAVICON_DRIVER_H_
+
+#include "components/favicon/core/favicon_driver_impl.h"
+#include "ios/web/public/web_state/web_state_observer.h"
+#include "ios/web/public/web_state/web_state_user_data.h"
+
+namespace web {
+struct FaviconStatus;
+class WebState;
+}
+
+namespace favicon {
+
+// WebFaviconDriver is an implementation of FaviconDriver that listen to
+// WebState events to start download of favicons and to get informed when the
+// favicon download has completed.
+class WebFaviconDriver : public web::WebStateObserver,
+                         public web::WebStateUserData<WebFaviconDriver>,
+                         public FaviconDriverImpl {
+ public:
+  static void CreateForWebState(web::WebState* web_state,
+                                FaviconService* favicon_service,
+                                history::HistoryService* history_service,
+                                bookmarks::BookmarkModel* bookmark_model);
+
+  // FaviconDriver implementation.
+  gfx::Image GetFavicon() const override;
+  bool FaviconIsValid() const override;
+  int StartDownload(const GURL& url, int max_bitmap_size) override;
+  bool IsOffTheRecord() override;
+  GURL GetActiveURL() override;
+  base::string16 GetActiveTitle() override;
+  bool GetActiveFaviconValidity() override;
+  void SetActiveFaviconValidity(bool valid) override;
+  GURL GetActiveFaviconURL() override;
+  void SetActiveFaviconURL(const GURL& url) override;
+  gfx::Image GetActiveFaviconImage() override;
+  void SetActiveFaviconImage(const gfx::Image& image) override;
+
+ private:
+  friend class web::WebStateUserData<WebFaviconDriver>;
+
+  WebFaviconDriver(web::WebState* web_state,
+                   FaviconService* favicon_service,
+                   history::HistoryService* history_service,
+                   bookmarks::BookmarkModel* bookmark_model);
+  ~WebFaviconDriver() override;
+
+  // web::WebStateObserver implementation.
+  void FaviconURLUpdated(
+      const std::vector<web::FaviconURL>& candidates) override;
+
+  // Returns the active navigation entry's favicon.
+  web::FaviconStatus& GetFaviconStatus();
+
+  DISALLOW_COPY_AND_ASSIGN(WebFaviconDriver);
+};
+
+}  // namespace favicon
+
+#endif  // COMPONENTS_FAVICON_IOS_WEB_FAVICON_DRIVER_H_