★ Record the image dominant color in the image database.

components/enhanced_bookmarks/persistent_image_store.h

 // Copyright 2014 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_ENHANCED_BOOKMARKS_PERSISTENT_IMAGE_STORE_H_
 #define COMPONENTS_ENHANCED_BOOKMARKS_PERSISTENT_IMAGE_STORE_H_
 
 #include "components/enhanced_bookmarks/image_store.h"
 
 #include "base/files/file_path.h"
 #include "sql/connection.h"
 #include "sql/init_status.h"
+#include "sql/meta_table.h"
 
 // The PersistentImageStore is an implementation of ImageStore that persists its
 // data on disk.
 class PersistentImageStore : public ImageStore {
  public:
   // Creates a PersistentImageStore in the directory at the given path.
   explicit PersistentImageStore(const base::FilePath& path);
   bool HasKey(const GURL& page_url) override;
   void Insert(const GURL& page_url,
-              const GURL& image_url,
-              const gfx::Image& image) override;
+              const enhanced_bookmarks::ImageRecord& image) override;
   void Erase(const GURL& page_url) override;
-  std::pair<gfx::Image, GURL> Get(const GURL& page_url) override;
+  enhanced_bookmarks::ImageRecord Get(const GURL& page_url) override;
   gfx::Size GetSize(const GURL& page_url) override;
   void GetAllPageUrls(std::set<GURL>* urls) override;
   void ClearAll() override;
   int64 GetStoreSizeInBytes() override;
 
  protected:
   ~PersistentImageStore() override;
 
  private:
   sql::InitStatus OpenDatabase();
 
   const base::FilePath path_;
   sql::Connection db_;
+  sql::MetaTable meta_table_;
 
   DISALLOW_COPY_AND_ASSIGN(PersistentImageStore);
 };
 
 #endif  // COMPONENTS_ENHANCED_BOOKMARKS_PERSISTENT_IMAGE_STORE_H_