Support detaching/attaching panels via inter-strip drags.

chrome/browser/ui/panels/overflow_panel_strip.cc

 // 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.
 
 #include "chrome/browser/ui/panels/overflow_panel_strip.h"
 
 #include "base/logging.h"
 #include "chrome/browser/ui/panels/docked_panel_strip.h"
 #include "chrome/browser/ui/panels/panel_manager.h"
 #include "chrome/browser/ui/panels/panel_mouse_watcher.h"
@@ skipping 97 matching lines @@
   // Update the overflow indicator only when the number of overflow panels go
   // beyond the maximum visible limit.
   if (num_panels() > max_visible_panels_) {
     if (!overflow_indicator_.get()) {
       overflow_indicator_.reset(PanelOverflowIndicator::Create());
     }
     UpdateOverflowIndicatorCount();
   }
 }
 
+void OverflowPanelStrip::AddPanelAtPosition(Panel* panel,
+                                            const gfx::Point& position) {
+  NOTREACHED();
+}
+
 bool OverflowPanelStrip::RemovePanel(Panel* panel) {
   size_t index = 0;
   Panels::iterator iter = panels_.begin();
   for (; iter != panels_.end(); ++iter, ++index)
     if (*iter == panel)
       break;
   if (iter == panels_.end())
     return false;
 
   panels_.erase(iter);
@@ skipping 267 matching lines @@
   // expanded overflow panels when in full screen mode so no need
   // to detect when mouse hovers over the overflow strip.
   if (is_full_screen)
     panel_manager_->mouse_watcher()->RemoveObserver(this);
   else
     panel_manager_->mouse_watcher()->AddObserver(this);
 
   for (size_t i = 0; i < panels_.size(); ++i)
     panels_[i]->FullScreenModeChanged(is_full_screen);
 }