Componentize FaviconTabHelper

components/favicon/content/content_favicon_driver.h

Index: components/favicon/content/content_favicon_driver.h
diff --git a/components/favicon/content/content_favicon_driver.h b/components/favicon/content/content_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_CONTENT_CONTENT_FAVICON_DRIVER_H_
+#define COMPONENTS_FAVICON_CONTENT_CONTENT_FAVICON_DRIVER_H_
+
+#include "components/favicon/core/favicon_driver_impl.h"
+#include "content/public/browser/web_contents_observer.h"
+#include "content/public/browser/web_contents_user_data.h"
+#include "url/gurl.h"
+
+namespace content {
+struct FaviconStatus;
+struct FaviconURL;
+class WebContents;
+}
+
+namespace favicon {
+
+// ContentFaviconDriver is an implementation of FaviconDriver that listens to
+// WebContents events to start download of favicons and to get informed when the
+// favicon download has completed.
+class ContentFaviconDriver
+    : public content::WebContentsObserver,
+      public content::WebContentsUserData<ContentFaviconDriver>,
+      public FaviconDriverImpl {
+ public:
+  static void CreateForWebContents(content::WebContents* web_contents,
+                                   FaviconService* favicon_service,
+                                   history::HistoryService* history_service,
+                                   bookmarks::BookmarkModel* bookmark_model);
+
+  // Returns the current tab's favicon URLs. If this is empty,
+  // DidUpdateFaviconURL has not yet been called for the current navigation.
+  const std::vector<content::FaviconURL>& favicon_urls() const {
+    return favicon_urls_;
+  }
+
+  // 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;
+
+ protected:
+  ContentFaviconDriver(content::WebContents* web_contents,
+                       FaviconService* favicon_service,
+                       history::HistoryService* history_service,
+                       bookmarks::BookmarkModel* bookmark_model);
+  ~ContentFaviconDriver() override;
+
+ private:
+  friend class content::WebContentsUserData<ContentFaviconDriver>;
+
+  // FaviconDriver implementation.
+  void NotifyFaviconUpdated(bool icon_url_changed) override;
+
+  // content::WebContentsObserver implementation.
+  void DidUpdateFaviconURL(
+      const std::vector<content::FaviconURL>& candidates) override;
+  void DidStartNavigationToPendingEntry(
+      const GURL& url,
+      content::NavigationController::ReloadType reload_type) override;
+  void DidNavigateMainFrame(
+      const content::LoadCommittedDetails& details,
+      const content::FrameNavigateParams& params) override;
+
+  // Returns the active navigation entry's favicon.
+  content::FaviconStatus& GetFaviconStatus();
+
+  GURL bypass_cache_page_url_;
+  std::vector<content::FaviconURL> favicon_urls_;
+
+  DISALLOW_COPY_AND_ASSIGN(ContentFaviconDriver);
+};
+
+}  // namespace favicon
+
+#endif  // COMPONENTS_FAVICON_CONTENT_CONTENT_FAVICON_DRIVER_H_