Land http://codereview.chromium.org/159067:

chrome/browser/views/tabs/tab_strip.cc

 // 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.
 
 #include "chrome/browser/views/tabs/tab_strip.h"
 
 #include "app/drag_drop_types.h"
 #include "app/gfx/canvas.h"
 #include "app/gfx/path.h"
 #include "app/l10n_util.h"
@@ skipping 721 matching lines @@
 
 
 ///////////////////////////////////////////////////////////////////////////////
 // TabStrip, TabStripModelObserver implementation:
 
 void TabStrip::TabInsertedAt(TabContents* contents,
                              int index,
                              bool foreground) {
   DCHECK(contents);
   DCHECK(index == TabStripModel::kNoTab || model_->ContainsIndex(index));
-
+  // This tab may be attached to another browser window, we should notify
+  // renderer.
+  contents->render_view_host()->UpdateBrowserWindowId(
+      contents->controller().window_id().id());
   if (active_animation_.get())
     active_animation_->Stop();
 
   bool contains_tab = false;
   Tab* tab = NULL;
   // First see if this Tab is one that was dragged out of this TabStrip and is
   // now being dragged back in. In this case, the DraggedTabController actually
   // has the Tab already constructed and we can just insert it into our list
   // again.
   if (IsDragSessionActive()) {
@@ skipping 880 matching lines @@
               &TabStrip::ResizeLayoutTabs),
           kResizeTabsTimeMs);
     }
   } else {
     // Mouse moved quickly out of the tab strip and then into it again, so
     // cancel the timer so that the strip doesn't move when the mouse moves
     // back over it.
     resize_layout_factory_.RevokeAll();
   }
 }