Harmony: Apply the upper bound on equal-sized button widths in DialogClientView.

ui/views/layout/layout_provider.h

 // Copyright 2017 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 UI_VIEWS_LAYOUT_LAYOUT_PROVIDER_H_
 #define UI_VIEWS_LAYOUT_LAYOUT_PROVIDER_H_
 
 #include "base/macros.h"
 #include "ui/gfx/geometry/insets.h"
 #include "ui/views/style/typography_provider.h"
@@ skipping 30 matching lines @@
 };
 
 enum DistanceMetric {
   // DistanceMetric enum values must always be greater than any InsetsMetric
   // value. This allows the code to verify at runtime that arguments of the
   // two types have not been interchanged.
   VIEWS_DISTANCE_START = VIEWS_INSETS_MAX,
 
   // The default padding to add on each side of a button's label.
   DISTANCE_BUTTON_HORIZONTAL_PADDING = VIEWS_DISTANCE_START,
+  // The maximum width a button can have and still influence the sizes of
+  // other linked buttons.  This allows short buttons to have linked widths
+  // without long buttons making things overly wide.
+  DISTANCE_BUTTON_MAX_LINKABLE_WIDTH,
   // The distance between a dialog's edge and the close button in the upper
   // trailing corner.
   DISTANCE_CLOSE_BUTTON_MARGIN,
   // The default minimum width of a dialog button.
   DISTANCE_DIALOG_BUTTON_MINIMUM_WIDTH,
   // The spacing between a pair of related horizontal buttons, used for
   // dialog layout.
   DISTANCE_RELATED_BUTTON_HORIZONTAL,
   // Horizontal spacing between controls that are logically related.
   DISTANCE_RELATED_CONTROL_HORIZONTAL,
@@ skipping 30 matching lines @@
 
  private:
   DefaultTypographyProvider typography_provider_;
 
   DISALLOW_COPY_AND_ASSIGN(LayoutProvider);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_LAYOUT_LAYOUT_PROVIDER_H_