Consider the popup window position when the window shows upward. This patch depends on WebKit patch.

chrome/browser/renderer_host/render_widget_host_view.h

 // Copyright (c) 2010 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_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_H_
 #define CHROME_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_H_
 #pragma once
 
 #if defined(OS_MACOSX)
 #include <OpenGL/OpenGL.h>
@@ skipping 78 matching lines @@
 
   // Notifies the View that it has become visible.
   virtual void DidBecomeSelected() = 0;
 
   // Notifies the View that it has been hidden.
   virtual void WasHidden() = 0;
 
   // Tells the View to size itself to the specified size.
   virtual void SetSize(const gfx::Size& size) = 0;
 
+  // Tells the View to move itself to the specified point.
+  virtual void MoveTo(const gfx::Point& origin) = 0;

[Ben Goodger (Google), 2011/02/01 17:57:24]

How about replacing both of these methods with

virtual void SetBounds(const gfx::Rect& rect) = 0;

+
   // Retrieves the native view used to contain plugins and identify the
   // renderer in IPC messages.
   virtual gfx::NativeView GetNativeView() = 0;
 
   // Moves all plugin windows as described in the given list.
   virtual void MovePluginWindows(
       const std::vector<webkit::npapi::WebPluginGeometry>& moves) = 0;
 
   // Actually set/take focus to/from the associated View component.
   virtual void Focus() = 0;
@@ skipping 203 matching lines @@
 
   // The current reserved area in view coordinates where contents should not be
   // rendered to draw the resize corner, sidebar mini tabs etc.
   gfx::Rect reserved_rect_;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(RenderWidgetHostView);
 };
 
 #endif  // CHROME_BROWSER_RENDERER_HOST_RENDER_WIDGET_HOST_VIEW_H_