Add GetCaptionButtonHeightInDIPs() method

chrome/browser/ui/views/frame/minimize_button_metrics_win.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_MINIMIZE_BUTTON_METRICS_WIN_H_
 #define CHROME_BROWSER_UI_VIEWS_FRAME_MINIMIZE_BUTTON_METRICS_WIN_H_
 
 #include <windows.h>
 
 #include "base/macros.h"
 
 // Class that implements obtaining the X coordinate of the native minimize
 // button for the native frame on Windows.
 // This is a separate class because obtaining it is somewhat tricky and this
 // code is shared between BrowserDesktopWindowTreeHostWin and BrowserFrameWin.
 class MinimizeButtonMetrics {
  public:
   MinimizeButtonMetrics();
   ~MinimizeButtonMetrics();
 
+  // Get the height of the native caption buttons in DIPs.

[Peter Kasting, 2017/04/26 17:19:52]

Nit: Get -> Returns (make comments declarative, not imperative)

+  static int GetCaptionButtonHeight();
+
   void Init(HWND hwnd);
 
   // Obtain the X offset of the native minimize button. Since Windows can lie
   // to us if we call this at the wrong moment, this might come from a cached
   // value rather than read when called.
   int GetMinimizeButtonOffsetX() const;
 
   // Must be called when hwnd_ is activated to update the minimize button
   // position cache.
   void OnHWNDActivated();
@@ skipping 10 matching lines @@
   HWND hwnd_;
 
   // Cached offset of the minimize button. If RTL this is the location of the
   // minimize button, if LTR this is the offset from the right edge of the
   // client area to the minimize button.
   mutable int cached_minimize_button_x_delta_;
 
   // Static cache of |cached_minimize_button_x_delta_|.
   static int last_cached_minimize_button_x_delta_;
 
-  // Static cache of offset value representing the different between
+  // Static cache of offset value representing the difference between
   // DWMWA_CAPTION_BUTTON_BOUNDS and WM_GETTITLEBARINFOEX
   static int button_bounds_position_offset_;
 
   // Has OnHWNDActivated() been invoked?
   bool was_activated_;
 
   DISALLOW_COPY_AND_ASSIGN(MinimizeButtonMetrics);
 };
 
 #endif  // CHROME_BROWSER_UI_VIEWS_FRAME_MINIMIZE_BUTTON_METRICS_WIN_H_