Extract minimal RenderViewHost interface for embedders, leaving

content/browser/tab_contents/web_drag_source_gtk.h

-// Copyright (c) 2011 The Chromium Authors. All rights reserved.
+// Copyright (c) 2012 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 CONTENT_BROWSER_TAB_WEB_DRAG_SOURCE_GTK_H_
 #define CONTENT_BROWSER_TAB_WEB_DRAG_SOURCE_GTK_H_
 #pragma once
 
 #include <gtk/gtk.h>
 
 #include "base/basictypes.h"
 #include "base/file_path.h"
 #include "base/message_loop.h"
 #include "base/string16.h"
 #include "content/common/content_export.h"
 #include "googleurl/src/gurl.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebDragOperation.h"
 #include "ui/base/gtk/gtk_signal.h"
 #include "ui/base/gtk/gtk_signal_registrar.h"
 #include "ui/gfx/native_widget_types.h"
 #include "ui/gfx/point.h"
 
+class RenderViewHostImpl;
 class SkBitmap;
 struct WebDropData;
 
 namespace content {
 
 class WebContents;
 
 // WebDragSourceGtk takes care of managing the drag from a WebContents
 // with Gtk.
 class CONTENT_EXPORT WebDragSourceGtk : public MessageLoopForUI::Observer {
@@ skipping 18 matching lines @@
                        GdkDragContext*, GtkDragResult);
   CHROMEGTK_CALLBACK_1(WebDragSourceGtk, void, OnDragBegin,
                        GdkDragContext*);
   CHROMEGTK_CALLBACK_1(WebDragSourceGtk, void, OnDragEnd,
                        GdkDragContext*);
   CHROMEGTK_CALLBACK_4(WebDragSourceGtk, void, OnDragDataGet,
                        GdkDragContext*, GtkSelectionData*, guint, guint);
   CHROMEGTK_CALLBACK_1(WebDragSourceGtk, gboolean, OnDragIconExpose,
                        GdkEventExpose*);
 
+  RenderViewHostImpl* GetRenderViewHost() const;
   gfx::NativeView GetContentNativeView() const;
 
   // The tab we're manging the drag for.
   content::WebContents* web_contents_;
 
   // The drop data for the current drag (for drags that originate in the render
   // view). Non-NULL iff there is a current drag.
   scoped_ptr<WebDropData> drop_data_;
 
   // The image used for depicting the drag, and the offset between the cursor
@@ skipping 33 matching lines @@
   GtkWidget* drag_icon_;
 
   ui::GtkSignalRegistrar signals_;
 
   DISALLOW_COPY_AND_ASSIGN(WebDragSourceGtk);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_TAB_WEB_DRAG_SOURCE_GTK_H_