Implement Harmony-style consistent button widths for Collected Cookies.

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 {
@@ skipping 28 matching lines @@
     // checkboxes below explanatory text/headings.
     SUBSECTION_HORIZONTAL_INDENT,
     // Horizontal spacing between controls that are logically unrelated.
     UNRELATED_CONTROL_HORIZONTAL_SPACING,
     // Larger horizontal spacing between unrelated controls.
     UNRELATED_CONTROL_HORIZONTAL_SPACING_LARGE,
     // Vertical spacing between controls that are logically unrelated.
     UNRELATED_CONTROL_VERTICAL_SPACING,
     // Larger vertical spacing between unrelated controls.
     UNRELATED_CONTROL_VERTICAL_SPACING_LARGE,
+    // The maximum width, beyond which a button will not influence the widths of
+    // other buttons on a shared row.
+    BUTTON_MAX_SHARED_WIDTH,
   };
 
   enum class DialogWidth {
     SMALL,
     MEDIUM,
     LARGE,
   };
 
   LayoutDelegate() {}
   virtual ~LayoutDelegate() {}
@@ skipping 29 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_