[gtk] re-acquire input grab on bubbles when another widget

ui/base/gtk/gtk_signal_registrar.h

 // Copyright (c) 2011 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 UI_BASE_GTK_GTK_SIGNAL_REGISTRAR_H_
 #define UI_BASE_GTK_GTK_SIGNAL_REGISTRAR_H_
 
 #include <glib.h>
 #include <map>
 #include <vector>
@@ skipping 31 matching lines @@
   GtkSignalRegistrar();
   ~GtkSignalRegistrar();
 
   // Connect before the default handler. Returns the handler id.
   glong Connect(gpointer instance, const gchar* detailed_signal,
                 GCallback signal_handler, gpointer data);
   // Connect after the default handler. Returns the handler id.
   glong ConnectAfter(gpointer instance, const gchar* detailed_signal,
                      GCallback signal_handler, gpointer data);
 
+  // Disconnects all signal handlers connected to |instance|.
+  void DisconnectAll(gpointer instance);
+
  private:
   typedef std::vector<glong> HandlerList;
   typedef std::map<GObject*, HandlerList> HandlerMap;
 
   static void WeakNotifyThunk(gpointer data, GObject* where_the_object_was) {
     reinterpret_cast<GtkSignalRegistrar*>(data)->WeakNotify(
         where_the_object_was);
   }
   void WeakNotify(GObject* where_the_object_was);
 
   glong ConnectInternal(gpointer instance, const gchar* detailed_signal,
                         GCallback signal_handler, gpointer data, bool after);
 
   HandlerMap handler_lists_;
 
   DISALLOW_COPY_AND_ASSIGN(GtkSignalRegistrar);
 };
 
 }  // namespace ui
 
 #endif  // UI_BASE_GTK_GTK_SIGNAL_REGISTRAR_H_