Add TitledUrlIndex for indexing arbitrary title/URL pairs

components/bookmarks/browser/titled_url_node.h

Index: components/bookmarks/browser/titled_url_node.h
diff --git a/components/bookmarks/browser/titled_url_node.h b/components/bookmarks/browser/titled_url_node.h
new file mode 100644
index 0000000000000000000000000000000000000000..3246a9daa639ea89f37759c087a1496b1eeb74e9
--- /dev/null
+++ b/components/bookmarks/browser/titled_url_node.h
@@ -0,0 +1,29 @@
+// Copyright 2016 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_BROWSER_TITLED_URL_NODE_H_
+#define COMPONENTS_BOOKMARKS_BROWSER_TITLED_URL_NODE_H_
+
+#include "url/gurl.h"
+
+namespace bookmarks {
+
+// TitledUrlNode is an interface for objects like bookmarks that expose a title
+// and URL. TitledUrlNodes can be added to a TitledUrlIndex to quickly retrieve
+// all nodes that contain a particular word in their title or URL.
+class TitledUrlNode {
+ public:
+  // Returns the title for the node.
+  virtual const base::string16& GetTitledUrlNodeTitle() const = 0;
+
+  // Returns the URL for the node.
+  virtual const GURL& GetTitledUrlNodeUrl() const = 0;
+
+ protected:
+  virtual ~TitledUrlNode() {}
+};
+
+}  // namespace bookmarks
+
+#endif  // COMPONENTS_BOOKMARKS_BROWSER_TITLED_URL_NODE_H_