GTK: implement extension bookmark manager drag api....

chrome/browser/gtk/bookmark_utils_gtk.h

 // Copyright (c) 2009 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 CHROME_BROWSER_GTK_BOOKMARK_UTILS_GTK_H_
 #define CHROME_BROWSER_GTK_BOOKMARK_UTILS_GTK_H_
 
 #include <gtk/gtk.h>
 #include <vector>
 #include <string>
@@ skipping 30 matching lines @@
 std::string BuildTooltipFor(const BookmarkNode* node);
 
 // Returns the "bookmark-node" property of |widget| casted to the correct type.
 const BookmarkNode* BookmarkNodeForWidget(GtkWidget* widget);
 
 // Set the colors on |label| as per the theme.
 void SetButtonTextColors(GtkWidget* label, GtkThemeProvider* provider);
 
 // Drag and drop. --------------------------------------------------------------
 
+// Get the DnD target mask for a bookmark drag. This will vary based on whether
+// the node in question is a folder.
+int GetCodeMask(bool folder);
+
 // Pickle a node into a GtkSelection.
 void WriteBookmarkToSelection(const BookmarkNode* node,
                               GtkSelectionData* selection_data,
                               guint target_type,
                               Profile* profile);
 
 // Pickle a vector of nodes into a GtkSelection.
 void WriteBookmarksToSelection(const std::vector<const BookmarkNode*>& nodes,
                                GtkSelectionData* selection_data,
                                guint target_type,
@@ skipping 21 matching lines @@
 // will be added whether or not the URL is valid.
 bool CreateNewBookmarksFromURIList(
     GtkSelectionData* selection_data,
     BookmarkModel* model,
     const BookmarkNode* parent,
     int idx);
 
 }  // namespace bookmark_utils
 
 #endif  // CHROME_BROWSER_GTK_BOOKMARK_UTILS_GTK_H_