Add GetCaptionButtonHeightInDIPs() method

chrome/browser/ui/views/frame/browser_desktop_window_tree_host_x11.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_VIEWS_FRAME_BROWSER_DESKTOP_WINDOW_TREE_HOST_X11_H_
 #define CHROME_BROWSER_UI_VIEWS_FRAME_BROWSER_DESKTOP_WINDOW_TREE_HOST_X11_H_
 
 #include "base/macros.h"
 #include "chrome/browser/ui/views/frame/browser_desktop_window_tree_host.h"
 #include "chrome/browser/ui/views/frame/global_menu_bar_x11.h"
@@ skipping 14 matching lines @@
       views::internal::NativeWidgetDelegate* native_widget_delegate,
       views::DesktopNativeWidgetAura* desktop_native_widget_aura,
       BrowserView* browser_view,
       BrowserFrame* browser_frame);
   ~BrowserDesktopWindowTreeHostX11() override;
 
  private:
   // Overridden from BrowserDesktopWindowTreeHost:
   DesktopWindowTreeHost* AsDesktopWindowTreeHost() override;
   int GetMinimizeButtonOffset() const override;
+  int GetMinimizeButtonHeight() const override;
   bool UsesNativeSystemMenu() const override;
 
   // Overridden from views::DesktopWindowTreeHostX11:
   void Init(aura::Window* content_window,
             const views::Widget::InitParams& params) override;
   void CloseNow() override;
 
   BrowserView* browser_view_;
 
   // Each browser frame maintains its own menu bar object because the lower
   // level dbus protocol associates a xid to a menu bar; we can't map multiple
   // xids to the same menu bar.
   std::unique_ptr<GlobalMenuBarX11> global_menu_bar_x11_;
 
   DISALLOW_COPY_AND_ASSIGN(BrowserDesktopWindowTreeHostX11);
 };
 
 #endif  // CHROME_BROWSER_UI_VIEWS_FRAME_BROWSER_DESKTOP_WINDOW_TREE_HOST_X11_H_