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diff --git a/webkit/glue/plugins/gtk_plugin_container.h b/webkit/glue/plugins/gtk_plugin_container.h
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+// 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 WEBKIT_GLUE_PLUGINS_GTK_PLUGIN_CONTAINER_H_
+#define WEBKIT_GLUE_PLUGINS_GTK_PLUGIN_CONTAINER_H_
+
+// Windowed plugins are embedded via XEmbed, which is implemented by
+// GtkPlug/GtkSocket. But we want to control sizing and positioning
+// directly, so we need a subclass of GtkSocket that sidesteps the
+// size_request handler.
+//
+// The custom size_request handler just reports the allocation, so it's
+// the owner's responsibility to call gtk_widget_size_allocate() with the
+// proper size.
+
+typedef struct _GtkWidget GtkWidget;
+
+// Return a new GtkPluginContainer.
+// Intentionally GTK-style here since we're creating a custom GTK widget.
+// This is a GtkSocket subclass; see its documentation for available methods.
+GtkWidget* gtk_plugin_container_new();
+
+#endif // WEBKIT_GLUE_PLUGINS_GTK_PLUGIN_CONTAINER_H_