Add GetCaptionButtonHeightInDIPs() method

chrome/browser/ui/views/frame/minimize_button_metrics_win.h

Index: chrome/browser/ui/views/frame/minimize_button_metrics_win.h
diff --git a/chrome/browser/ui/views/frame/minimize_button_metrics_win.h b/chrome/browser/ui/views/frame/minimize_button_metrics_win.h
index c3a6d3f34bbf82a68d207684750dc51576c1e4e1..aa315e2684b9dcdedba0972870e1a841844f8699 100644
--- a/chrome/browser/ui/views/frame/minimize_button_metrics_win.h
+++ b/chrome/browser/ui/views/frame/minimize_button_metrics_win.h
@@ -25,6 +25,10 @@ class MinimizeButtonMetrics {
   // value rather than read when called.
   int GetMinimizeButtonOffsetX() const;
 
+  // Obtain the height of the native caption button.
+  // As for GetMinimizeButtonOffsetX(), this might come from a cached value.
+  int GetCaptionButtonHeight() const;
+
   // Must be called when hwnd_ is activated to update the minimize button
   // position cache.
   void OnHWNDActivated();
@@ -48,10 +52,13 @@ class MinimizeButtonMetrics {
   // 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_;
 
+  // Static cache of Windows caption button height.
+  static int caption_button_height_;
+
   // Has OnHWNDActivated() been invoked?
   bool was_activated_;