Report the plugin position to windowed plugins as (0,0)...

webkit/glue/webplugin.h

 // Copyright (c) 2006-2008 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_WEBPLUGIN_H__
 #define WEBKIT_GLUE_WEBPLUGIN_H__
 
 #include <string>
 #include <vector>
 
@@ skipping 71 matching lines @@
   WebPlugin() { }
   virtual ~WebPlugin() { }
 
   // Called by the plugin delegate to let the WebPlugin know if the plugin is
   // windowed (i.e. handle is not NULL) or windowless (handle is NULL).  This
   // tells the WebPlugin to send mouse/keyboard events to the plugin delegate,
   // as well as the information about the HDC for paint operations.
   // The pump_messages_event is a event handle which is valid only for
   // windowless plugins and is used in NPP_HandleEvent calls to pump messages
   // if the plugin enters a modal loop.
-  virtual void SetWindow(gfx::NativeView window,
+  // The return value is only valid for windowed plugins.  If true, it means
+  // that the the HWND position should be managed by the delegate.  If false,
+  // the plugin should be kept at the origin and it'll get moved elsewhere.
+  virtual bool SetWindow(gfx::NativeView window,
                          HANDLE pump_messages_event) = 0;
   // Cancels a pending request.
   virtual void CancelResource(int id) = 0;
   virtual void Invalidate() = 0;
   virtual void InvalidateRect(const gfx::Rect& rect) = 0;
 
   // Returns the NPObject for the browser's window object.
   virtual NPObject* GetWindowScriptNPObject() = 0;
 
   // Returns the DOM element that loaded the plugin.
@@ skipping 57 matching lines @@
                                   bool* cancel) = 0;
   virtual void DidReceiveData(const char* buffer, int length,
                               int data_offset) = 0;
   virtual void DidFinishLoading() = 0;
   virtual void DidFail() = 0;
   virtual bool IsMultiByteResponseExpected() = 0;
 };
 
 
 #endif  // #ifndef WEBKIT_GLUE_WEBPLUGIN_H__