Position close buttons in bubbles based on a layout delegate constant.

chrome/browser/ui/views/harmony/layout_delegate.h

 // Copyright 2016 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_HARMONY_LAYOUT_DELEGATE_H_
 #define CHROME_BROWSER_UI_VIEWS_HARMONY_LAYOUT_DELEGATE_H_
 
 #include "ui/views/layout/grid_layout.h"
 
 class LayoutDelegate {
  public:
   enum class Metric {
     // Horizontal or vertical margin between the edge of a dialog and a
     // contained button.
     DIALOG_BUTTON_MARGIN,
+    // Horizontal or vertical margin between the edge of a dialog and the close
+    // button in the upper trailing corner.
+    DIALOG_CLOSE_BUTTON_MARGIN,
     // Horizontal or vertical margin between the edge of a panel and the
     // contained content.
     PANEL_CONTENT_MARGIN,
     // Horizontal spacing between buttons that are logically related, e.g.
     // for a button set.
     RELATED_BUTTON_HORIZONTAL_SPACING,
     // Horizontal spacing between other controls that are logically related.
     RELATED_CONTROL_HORIZONTAL_SPACING,
     // Vertical spacing between controls that are logically related.
     RELATED_CONTROL_VERTICAL_SPACING,
@@ skipping 49 matching lines @@
 
   // Returns the preferred width in DIPs for a dialog of the specified |width|.
   // May return 0 if the dialog has no preferred width.
   virtual int GetDialogPreferredWidth(DialogWidth width) const;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(LayoutDelegate);
 };
 
 #endif  // CHROME_BROWSER_UI_VIEWS_HARMONY_LAYOUT_DELEGATE_H_