Correctly update drag status for drags over renderer. This makes things look ...

chrome/browser/gtk/gtk_dnd_util.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_GTK_DND_UTIL_H_
 #define CHROME_BROWSER_GTK_GTK_DND_UTIL_H_
 
 #include <gtk/gtk.h>
 
 class GtkDndUtil {
  public:
   // Registry of all internal int codes for drag and drop.
   enum {
     // Intra-application types.
     CHROME_TAB = 1 << 0,
     CHROME_BOOKMARK_ITEM = 1 << 1,
     CHROME_WEBDROP_FILE_CONTENTS = 1 << 2,
     CHROME_NAMED_URL = 1 << 3,
 
     // Standard types.
     TEXT_PLAIN = 1 << 4,
     TEXT_URI_LIST = 1 << 5,
     TEXT_HTML = 1 << 6,
+
+    INVALID_TARGET = 1 << 7,
   };
 
   // Get the atom for a given target (of the above enum type). Will return NULL
   // for non-custom targets, such as CHROME_TEXT_PLAIN.
   static GdkAtom GetAtomForTarget(int target);
 
   // Creates a target list from the given mask. The mask should be an OR of
   // CHROME_* values. The target list is returned with ref count 1; the caller
   // is responsible for unreffing it when it is no longer needed.
   // Since the MIME type for WEBDROP_FILE_CONTENTS depends on the file's
   // contents, that flag is ignored by this function. It is the responsibility
   // of the client code to do the right thing.
   static GtkTargetList* GetTargetListFromCodeMask(int code_mask);
 
-  // Set the drag target list for |dest| or |source| with the target list that
+  // Set the drag target list for |source| with the target list that
   // corresponds to |code_mask|.
-  static void SetDestTargetListFromCodeMask(GtkWidget* dest, int code_mask);
   static void SetSourceTargetListFromCodeMask(GtkWidget* source, int code_mask);
 
+  // Set the accepted targets list for |dest|. The |target_codes| array should
+  // be sorted in preference order and should be terminated with 0.
+  static void SetDestTargetList(GtkWidget* dest, const int* target_codes);
+
  private:
   GtkDndUtil();
+
+  static void AddTargetToList(GtkTargetList* targets, int target_code);
 };
 
 #endif  // CHROME_BROWSER_GTK_GTK_DND_UTIL_H_