Add key modifier on minimize/restore button click to minimize/restore all Panels for Mac.

chrome/browser/ui/panels/panel_strip.h

 // 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.
 
 #ifndef CHROME_BROWSER_UI_PANELS_PANEL_STRIP_H_
 #define CHROME_BROWSER_UI_PANELS_PANEL_STRIP_H_
 #pragma once
 
 #include "chrome/browser/ui/panels/panel_constants.h"
 #include "ui/gfx/point.h"
@@ skipping 72 matching lines @@
   // Click behavior may be modified as indicated by |modifier|.
   virtual void OnPanelTitlebarClicked(Panel* panel,
                                       panel::ClickModifier modifier) = 0;
 
   // Called when a panel in the strip becomes active or inactive.
   virtual void OnPanelActiveStateChanged(Panel* panel) = 0;
 
   // Updates the display to show |panel| as active.
   virtual void ActivatePanel(Panel* panel) = 0;
 
-  // Updates the display to show |panel| as  minimized/restored.
+  // Updates the display to show |panel| as minimized/restored.
   virtual void MinimizePanel(Panel* panel) = 0;
   virtual void RestorePanel(Panel* panel) = 0;
 
+  // Updates the display to show all panels in the strip as minimized/restored.
+  virtual void MinimizeAll() = 0;
+  virtual void RestoreAll() = 0;
+
   virtual bool CanMinimizePanel(const Panel* panel) const = 0;
   virtual bool IsPanelMinimized(const Panel* panel) const = 0;
 
   // Saves/restores/discards the placement information of |panel|. This is
   // useful in bringing back the dragging panel to its original positioning
   // when the drag is cancelled. After the placement information is saved,
   // the caller should only call one of RestorePanelToSavedPlacement or
   // DiscardSavedPanelPlacement.
   virtual void SavePanelPlacement(Panel* panel) = 0;
   virtual void RestorePanelToSavedPlacement() = 0;
@@ skipping 27 matching lines @@
   virtual void UpdatePanelOnStripChange(Panel* panel) = 0;
 
  protected:
   explicit PanelStrip(Type type);
   virtual ~PanelStrip();
 
   const Type type_;  // Type of this panel strip.
 };
 
 #endif  // CHROME_BROWSER_UI_PANELS_PANEL_STRIP_H_