Implement Harmony-style consistent button widths for Collected Cookies.

ui/views/layout/grid_layout.h

Index: ui/views/layout/grid_layout.h
diff --git a/ui/views/layout/grid_layout.h b/ui/views/layout/grid_layout.h
index e6a1ee35496efa63e064a1b845fde3f87f061fa0..020f0be3c0c62f4986012b12837afb6bcecc3005 100644
--- a/ui/views/layout/grid_layout.h
+++ b/ui/views/layout/grid_layout.h
@@ -300,6 +300,11 @@ class VIEWS_EXPORT ColumnSet {
   // LinkColumnSizes(0, 1, -1);
   void LinkColumnSizes(int first, ...);
 
+  // When sizing linked columns, columns wider than |size_limit| are ignored.
+  void set_linked_column_size_limit(int size_limit) {
+    linked_column_size_limit_ = size_limit;
+  }
+
   // ID of this ColumnSet.
   int id() const { return id_; }
 
@@ -355,6 +360,9 @@ class VIEWS_EXPORT ColumnSet {
   // ID for this columnset.
   const int id_;
 
+  // Threshold to ignore a column when unifying same sized columns.
+  int linked_column_size_limit_;
+
   // The columns.
   std::vector<std::unique_ptr<Column>> columns_;