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.

[Peter Kasting, 2017/03/07 02:50:37]

Nit: "Columns wider than this limit will be ignored when computing linked
columns' sizes."?  ("unifying" here seems unclear and I don't think "same sized"
is the phrase you want, since the point is that these are initially of different
sizes.  That said, your comments do follow the function name
UnifySameSizedColumnSizes()... so I guess maybe this is a suggestion that that
function be renamed to ComputeLinkedColumnSizes() or something.)

[tapted, 2017/03/07 12:06:41]

Done.
wdyt of UnifyLinkedColumnSizes()?  (Done.) (since it applies them as well as
computing them..) "unify" seems the right fit to me, suggests `to make uniform`,
although I guess that would be homogenize.

[Peter Kasting, 2017/03/07 21:22:49]

SGTM

+  int linked_column_size_limit_;
+
   // The columns.
   std::vector<std::unique_ptr<Column>> columns_;