Update Panel mininimize/restore button on strip and expansion state change.

chrome/browser/ui/panels/detached_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/detached_panel_strip.h"
 
 #include <algorithm>
 #include "base/logging.h"
 #include "chrome/browser/ui/panels/panel_drag_controller.h"
 #include "chrome/browser/ui/panels/panel_manager.h"
@@ skipping 20 matching lines @@
 
 void DetachedPanelStrip::RefreshLayout() {
   // Nothing needds to be done here: detached panels always stay
   // where the user dragged them.
 }
 
 void DetachedPanelStrip::AddPanel(Panel* panel,
                                   PositioningMask positioning_mask) {
   // positioning_mask is ignored since the detached panel is free-floating.
   DCHECK_NE(this, panel->panel_strip());
-  panel->SetPanelStrip(this);
+  panel->set_panel_strip(this);
   panels_.insert(panel);
 }
 
 void DetachedPanelStrip::RemovePanel(Panel* panel) {
   DCHECK_EQ(this, panel->panel_strip());
-  panel->SetPanelStrip(NULL);
+  panel->set_panel_strip(NULL);
   panels_.erase(panel);
 }
 
 void DetachedPanelStrip::CloseAll() {
   // Make a copy as closing panels can modify the iterator.
   Panels panels_copy = panels_;
 
   for (Panels::const_iterator iter = panels_copy.begin();
        iter != panels_copy.end(); ++iter)
     (*iter)->Close();
@@ skipping 131 matching lines @@
 bool DetachedPanelStrip::HasPanel(Panel* panel) const {
   return panels_.find(panel) != panels_.end();
 }
 
 void DetachedPanelStrip::UpdatePanelOnStripChange(Panel* panel) {
   panel->set_attention_mode(
       static_cast<Panel::AttentionMode>(Panel::USE_PANEL_ATTENTION |
                                         Panel::USE_SYSTEM_ATTENTION));
   panel->SetAlwaysOnTop(false);
   panel->EnableResizeByMouse(true);
+  panel->UpdateMinimizeRestoreButtonVisibility();
 }
 
 void DetachedPanelStrip::OnPanelActiveStateChanged(Panel* panel) {
 }