Support detaching/attaching panels via inter-strip drags.

chrome/browser/ui/panels/panel_manager.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/panel_manager.h"
 
 #include "base/auto_reset.h"
 #include "base/command_line.h"
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
@@ skipping 52 matching lines @@
 }
 
 PanelManager::PanelManager()
     : panel_mouse_watcher_(PanelMouseWatcher::Create()),
       auto_sizing_enabled_(true),
       is_full_screen_(false),
       is_processing_overflow_(false) {
   detached_strip_.reset(new DetachedPanelStrip(this));
   docked_strip_.reset(new DockedPanelStrip(this));
   overflow_strip_.reset(new OverflowPanelStrip(this));
-  drag_controller_.reset(new PanelDragController());
+  drag_controller_.reset(new PanelDragController(this));
   auto_hiding_desktop_bar_ = AutoHidingDesktopBar::Create(this);
   OnDisplayChanged();
 }
 
 PanelManager::~PanelManager() {
 }
 
 void PanelManager::OnDisplayChanged() {
 #if defined(OS_MACOSX)
   // On OSX, panels should be dropped all the way to the bottom edge of the
@@ skipping 239 matching lines @@
   return panels;
 }
 
 int PanelManager::overflow_strip_width() const {
   return kOverflowStripThickness;
 }
 
 void PanelManager::SetMouseWatcher(PanelMouseWatcher* watcher) {
   panel_mouse_watcher_.reset(watcher);
 }