Introduce BookmarkClient interface to abstract embedder

components/bookmarks/core/browser/bookmark_client.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_BOOKMARKS_CORE_BROWSER_BOOKMARK_CLIENT_H_
+#define COMPONENTS_BOOKMARKS_CORE_BROWSER_BOOKMARK_CLIENT_H_
+
+#include <set>
+#include <vector>
+
+#include "base/callback.h"
+#include "base/task/cancelable_task_tracker.h"
+
+class GURL;
+class BookmarkNode;
+class BookmarkModel;
+
+namespace base {
+struct UserMetricsAction;
+}
+
+namespace favicon_base {
+struct FaviconImageResult;
+}
+
+namespace tracked_objects {
+class Location;
+}
+
+// This class abstracts operations that depends on the embedder's environment,
+// e.g. Chrome.
+class BookmarkClient {
+ public:
+  // Callback for GetFaviconImageForURL().
+  typedef base::Callback<void(const favicon_base::FaviconImageResult&)>
+      FaviconImageCallback;
+
+  // Types representing a set of BookmarkNode and a mapping from BookmarkNode
+  // to the number of time the corresponding URL has been typed by the user in
+  // the Omnibox.
+  typedef std::set<const BookmarkNode*> NodeSet;
+  typedef std::pair<const BookmarkNode*, int> NodeTypedCountPair;
+  typedef std::vector<NodeTypedCountPair> NodeTypedCountPairs;
+
+  // Requests the favicon of any of |icon_types| whose pixel sizes most
+  // closely match |desired_size_in_dip| (if value is 0, the largest favicon
+  // is returned) and desired scale factor for |page_url|. |callback| is run
+  // when the bits have been fetched. |icon_types| can be any combination of
+  // IconType value, but only one icon will be returned.
+  virtual base::CancelableTaskTracker::TaskId GetFaviconImageForURL(
+      const GURL& page_url,
+      int icon_types,
+      int desired_size_in_dip,
+      const FaviconImageCallback& callback,
+      base::CancelableTaskTracker* tracker) = 0;
+
+  // Returns true if the embedder supports typed count for URL.
+  virtual bool SupportsTypedCountForNodes() = 0;
+
+  // Retrieves the number of time each BookmarkNode URL has been typed in
+  // the Omnibox by the user.
+  virtual void GetTypedCountForNodes(
+      const NodeSet& nodes,
+      NodeTypedCountPairs* node_typed_count_pairs) = 0;
+
+  // Wrapper around RecordAction defined in base/metrics/user_metrics.h
+  // that ensure that the action is posted from the correct thread.
+  virtual void RecordAction(const base::UserMetricsAction& action) = 0;
+
+ private:
+  friend class BookmarkModel;
+
+  virtual void OnLoad() = 0;
+
+  virtual void OnClearStore() = 0;
+
+  // Notifies the history backend about urls of removed bookmarks.
+  virtual void NotifyHistoryAboutRemovedBookmarks(
+      const std::set<GURL>& removed_bookmark_urls) const = 0;
+
+ protected:
+  virtual ~BookmarkClient() {}
+};
+
+#endif  // COMPONENTS_BOOKMARKS_CORE_BROWSER_BOOKMARK_CLIENT_H_