[Docking] Persists docked state for tab-less browser windows

ui/views/widget/native_widget_aura.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 UI_VIEWS_WIDGET_NATIVE_WIDGET_AURA_H_
 #define UI_VIEWS_WIDGET_NATIVE_WIDGET_AURA_H_
 
 #include "base/memory/scoped_vector.h"
 #include "base/memory/weak_ptr.h"
 #include "ui/aura/client/focus_change_observer.h"
@@ skipping 174 matching lines @@
   int OnPerformDrop(const ui::DropTargetEvent& event) override;
 
  protected:
   ~NativeWidgetAura() override;
 
   internal::NativeWidgetDelegate* delegate() { return delegate_; }
 
  private:
   class ActiveWindowObserver;
 
+  bool IsDocked() const;
   void SetInitialFocus(ui::WindowShowState show_state);
 
   internal::NativeWidgetDelegate* delegate_;
 
   // WARNING: set to NULL when destroyed. As the Widget is not necessarily
   // destroyed along with |window_| all usage of |window_| should first verify
   // non-NULL.
   aura::Window* window_;
 
   // See class documentation for Widget in widget.h for a note about ownership.
@@ skipping 19 matching lines @@
   // The following factory is used for calls to close the NativeWidgetAura
   // instance.
   base::WeakPtrFactory<NativeWidgetAura> close_widget_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(NativeWidgetAura);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_WIDGET_NATIVE_WIDGET_AURA_H_