Add GetMinimumSize() for Borders, and make LabelButton auto-size to at least as

ui/views/controls/button/label_button.cc

Index: ui/views/controls/button/label_button.cc
===================================================================
--- ui/views/controls/button/label_button.cc	(revision 236640)
+++ ui/views/controls/button/label_button.cc	(working copy)
@@ -188,6 +188,9 @@
   const gfx::Insets insets(GetInsets());
   size.Enlarge(image_size.width() + insets.width(), insets.height());
 
+  // Make the size at least as large as the minimum size needed by the border.
+  size.SetToMax(border()->GetMinimumSize());
+
   // Increase the minimum size monotonically with the preferred size.
   size.SetToMax(min_size_);
   min_size_ = size;