Make panel adjust bounds per preferred size change notification on Windows.

chrome/browser/ui/panels/native_panel.h

 // Copyright (c) 2011 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_NATIVE_PANEL_H_
 #define CHROME_BROWSER_UI_PANELS_NATIVE_PANEL_H_
 #pragma once
 
 #include "chrome/browser/ui/panels/panel.h"
 #include "ui/gfx/native_widget_types.h"
@@ skipping 44 matching lines @@
   virtual bool IsPanelActive() const = 0;
   virtual gfx::NativeWindow GetNativePanelHandle() = 0;
   virtual void UpdatePanelTitleBar() = 0;
   virtual void ShowTaskManagerForPanel() = 0;
   virtual FindBar* CreatePanelFindBar() = 0;
   virtual void NotifyPanelOnUserChangedTheme() = 0;
   virtual void DrawAttention() = 0;
   virtual bool IsDrawingAttention() const = 0;
   virtual Browser* GetPanelBrowser() const = 0;
   virtual void DestroyPanelBrowser() = 0;
+
+  // Returns the extent of the non-client area, that is, the window size minus
+  // the size of the client area.
+  virtual gfx::Size GetNonClientAreaExtent() const = 0;
+
+  // Gets or sets the restored height, which is the full height of the panel
+  // when it is expanded.
+  virtual int GetRestoredHeight() const = 0;
+  virtual void SetRestoredHeight(int height) = 0;
 };
 
 // A NativePanel utility interface used for accessing elements of the
 // native panel used only by test automation.
 class NativePanelTesting {
  public:
   static NativePanelTesting* Create(NativePanel* native_panel);
 
   // clang gives error on delete if the destructor is not virtual.
   virtual ~NativePanelTesting() {}
 
   virtual void PressLeftMouseButtonTitlebar(const gfx::Point& point) = 0;
   virtual void ReleaseMouseButtonTitlebar() = 0;
   virtual void DragTitlebar(int delta_x, int delta_y) = 0;
   virtual void CancelDragTitlebar() = 0;
   virtual void FinishDragTitlebar() = 0;
 };
 
 #endif  // CHROME_BROWSER_UI_PANELS_NATIVE_PANEL_H_