Extend HistoryService with support for favicons from Google servers

components/history/core/browser/history_backend.h

 // Copyright (c) 2012 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_HISTORY_CORE_BROWSER_HISTORY_BACKEND_H_
 #define COMPONENTS_HISTORY_CORE_BROWSER_HISTORY_BACKEND_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 307 matching lines @@
                     const GURL& icon_url,
                     favicon_base::IconType icon_type,
                     scoped_refptr<base::RefCountedMemory> bitmap_data,
                     const gfx::Size& pixel_size);
 
   void SetFavicons(const GURL& page_url,
                    favicon_base::IconType icon_type,
                    const GURL& icon_url,
                    const std::vector<SkBitmap>& bitmaps);
 
+  bool SetLastResortFavicons(const GURL& page_url,
+                             favicon_base::IconType icon_type,
+                             const GURL& icon_url,
+                             const std::vector<SkBitmap>& bitmaps);
+
   void SetFaviconsOutOfDateForPage(const GURL& page_url);
 
   void SetImportedFavicons(
       const favicon_base::FaviconUsageDataList& favicon_usage);
 
   // Downloads -----------------------------------------------------------------
 
   uint32_t GetNextDownloadId();
   void QueryDownloads(std::vector<DownloadRow>* rows);
   void UpdateDownload(const DownloadRow& data, bool should_commit_immediately);
@@ skipping 169 matching lines @@
   FRIEND_TEST_ALL_PREFIXES(HistoryBackendTest,
                            SetFaviconMappingsForPageAndRedirects);
   FRIEND_TEST_ALL_PREFIXES(HistoryBackendTest,
                            SetFaviconMappingsForPageAndRedirectsWithFragment);
   FRIEND_TEST_ALL_PREFIXES(HistoryBackendTest,
                            SetFaviconMappingsForPageDuplicates);
   FRIEND_TEST_ALL_PREFIXES(HistoryBackendTest, SetFaviconsDeleteBitmaps);
   FRIEND_TEST_ALL_PREFIXES(HistoryBackendTest, SetFaviconsReplaceBitmapData);
   FRIEND_TEST_ALL_PREFIXES(HistoryBackendTest,
                            SetFaviconsSameFaviconURLForTwoPages);
+  FRIEND_TEST_ALL_PREFIXES(HistoryBackendTest, SetLastResortFaviconsForEmptyDB);
+  FRIEND_TEST_ALL_PREFIXES(HistoryBackendTest,
+                           SetLastResortFaviconsForPageInDB);
+  FRIEND_TEST_ALL_PREFIXES(HistoryBackendTest,
+                           SetLastResortFaviconsForIconInDB);
   FRIEND_TEST_ALL_PREFIXES(HistoryBackendTest,
                            UpdateFaviconMappingsAndFetchNoChange);
   FRIEND_TEST_ALL_PREFIXES(HistoryBackendTest, MergeFaviconPageURLNotInDB);
   FRIEND_TEST_ALL_PREFIXES(HistoryBackendTest, MergeFaviconPageURLInDB);
   FRIEND_TEST_ALL_PREFIXES(HistoryBackendTest, MergeFaviconMaxFaviconsPerPage);
   FRIEND_TEST_ALL_PREFIXES(HistoryBackendTest,
                            MergeFaviconIconURLMappedToDifferentPageURL);
   FRIEND_TEST_ALL_PREFIXES(HistoryBackendTest,
                            MergeFaviconMaxFaviconBitmapsPerIconURL);
   FRIEND_TEST_ALL_PREFIXES(HistoryBackendTest,
@@ skipping 125 matching lines @@
   // Update the segment information. This is called internally when a page is
   // added. Return the segment id of the segment that has been updated.
   SegmentID UpdateSegments(const GURL& url,
                            VisitID from_visit,
                            VisitID visit_id,
                            ui::PageTransition transition_type,
                            const base::Time ts);
 
   // Favicons ------------------------------------------------------------------
 
+  // If |bitmaps_are_expired| is true, the icon for |icon_url| will be modified
+  // only if it's not present in the database. In that case, it will be
+  // initially set as expired. Returns whether the new bitmaps were actually
+  // written.
+  bool SetFaviconsImpl(const GURL& page_url,
+                       favicon_base::IconType icon_type,
+                       const GURL& icon_url,
+                       const std::vector<SkBitmap>& bitmaps,
+                       bool bitmaps_are_expired);
+
   // Used by both UpdateFaviconMappingsAndFetch and GetFavicons.
   // If |page_url| is non-null, the icon urls for |page_url| (and all
   // redirects) are set to the subset of |icon_urls| for which icons are
   // already stored in the database.
   // If |page_url| is non-null, |icon_types| can be multiple icon types
   // only if |icon_types| == TOUCH_ICON | TOUCH_PRECOMPOSED_ICON.
   // If multiple icon types are specified, |page_url| will be mapped to the
   // icon URLs of the largest type available in the database.
   void UpdateFaviconMappingsAndFetchImpl(
       const GURL* page_url,
@@ skipping 221 matching lines @@
   // Init is called. Defined after observers_ because it unregisters itself as
   // observer during destruction.
   std::unique_ptr<TypedUrlSyncableService> typed_url_syncable_service_;
 
   DISALLOW_COPY_AND_ASSIGN(HistoryBackend);
 };
 
 }  // namespace history
 
 #endif  // COMPONENTS_HISTORY_CORE_BROWSER_HISTORY_BACKEND_H_