Relanding with v8 fix....

chrome/renderer/render_widget.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_RENDERER_RENDER_WIDGET_H_
 #define CHROME_RENDERER_RENDER_WIDGET_H_
 
 #include <vector>
 #include "base/basictypes.h"
 #include "base/gfx/native_widget_types.h"
@@ skipping 133 matching lines @@
                            int cursor_position,
                            int target_start, int target_end,
                            const string16& ime_string);
   void OnMsgRepaint(const gfx::Size& size_to_paint);
   void OnSetTextDirection(WebKit::WebTextDirection direction);
 
   // Override point to notify that a paint has happened. This fires after the
   // browser side has updated the screen for a newly painted region.
   virtual void DidPaint() {}
 
+  // Sets the "hidden" state of this widget.  All accesses to is_hidden_ should
+  // use this method so that we can properly inform the RenderThread of our
+  // state.
+  void SetHidden(bool hidden);
+
   // True if a PaintRect_ACK message is pending.
   bool paint_reply_pending() const {
     return paint_reply_pending_;
   }
 
   // True if a ScrollRect_ACK message is pending.
   bool scroll_reply_pending() const {
     return current_scroll_buf_ != NULL;
   }
 
@@ skipping 136 matching lines @@
   // we track the pending size temporarily.
   int pending_window_rect_count_;
   WebKit::WebRect pending_window_rect_;
 
   scoped_ptr<ViewHostMsg_ShowPopup_Params> popup_params_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderWidget);
 };
 
 #endif  // CHROME_RENDERER_RENDER_WIDGET_H_