Make the extra padding around VectorIconButtons configurable.

ui/views/bubble/bubble_frame_view.cc

 // 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.
 
 #include "ui/views/bubble/bubble_frame_view.h"
 
 #include <algorithm>
 #include <utility>
 
 #include "build/build_config.h"
@@ skipping 32 matching lines @@
 const SkColor kFootnoteBackgroundColor = SkColorSetRGB(245, 245, 245);
 
 // Color of the top border of the footnote.
 const SkColor kFootnoteBorderColor = SkColorSetRGB(229, 229, 229);
 
 constexpr int kClosePaddingRight = 7;
 constexpr int kClosePaddingTop = 7;
 
 // The MD spec states that the center of the "x" should be 16x16 from the top
 // right of the dialog.
-constexpr int kClosePaddingRightMd = 4;
-constexpr int kClosePaddingTopMd = 4;
+constexpr int kClosePaddingRightMd = 8;
+constexpr int kClosePaddingTopMd = 8;
 
 // Get the |vertical| or horizontal amount that |available_bounds| overflows
 // |window_bounds|.
 int GetOffScreenLength(const gfx::Rect& available_bounds,
                        const gfx::Rect& window_bounds,
                        bool vertical) {
   if (available_bounds.IsEmpty() || available_bounds.Contains(window_bounds))
     return 0;
 
   //  window_bounds
@@ skipping 476 matching lines @@
   size.Enlarge(client_insets.width(), client_insets.height());
   size.SetToMax(gfx::Size(title_bar_width, 0));
 
   if (footnote_container_)
     size.Enlarge(0, footnote_container_->GetHeightForWidth(size.width()));
 
   return size;
 }
 
 }  // namespace views