Progress towards fixing 77536

ui/gfx/gtk_native_view_id_manager.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_GFX_GTK_NATIVE_VIEW_ID_MANAGER_H_
 #define UI_GFX_GTK_NATIVE_VIEW_ID_MANAGER_H_
 #pragma once
 
 #include <map>
 
@@ skipping 54 matching lines @@
   // widget to create a window.
   //
   // Keeping the XID permanent requires a bit of overhead, so it must
   // be explicitly requested.
   //
   // xid: (output) the resulting X window
   // id: a value previously returned from GetIdForWidget
   // returns: true if |id| is a valid id, false otherwise.
   bool GetPermanentXIDForId(XID* xid, gfx::NativeViewId id);
 
+  // Can be called from any thread.
+  // Will return false if the given XID isn't permanent or has already been
+  // released.
+  bool AddRefPermanentXID(XID xid);
+
   // Must be called from the UI thread because we may need to access a
   // GtkWidget or destroy a GdkWindow.
   //
   // If the widget associated with the XID is still alive, allow the widget
   // to destroy the associated XID when it wants. Otherwise, destroy the
   // GdkWindow associated with the XID.
   void ReleasePermanentXID(XID xid);
 
   // These are actually private functions, but need to be called from statics.
   void OnRealize(gfx::NativeView widget);
@@ skipping 47 matching lines @@
   //
   // An XID will map to NULL, if there is an outstanding reference but the
   // widget was destroyed. In this case, the destruction of the X window
   // is deferred to the dropping of all references.
   std::map<XID, PermanentXIDInfo> perm_xid_to_info_;
 
   DISALLOW_COPY_AND_ASSIGN(GtkNativeViewManager);
 };
 
 #endif  // UI_GFX_GTK_NATIVE_VIEW_ID_MANAGER_H_