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

ui/views/controls/button/text_button.cc

Index: ui/views/controls/button/text_button.cc
===================================================================
--- ui/views/controls/button/text_button.cc	(revision 236640)
+++ ui/views/controls/button/text_button.cc	(working copy)
@@ -78,6 +78,10 @@
   return insets_;
 }
 
+gfx::Size TextButtonBorder::GetMinimumSize() const {
+  return gfx::Size();
+}
+
 void TextButtonBorder::SetInsets(const gfx::Insets& insets) {
   insets_ = insets;
 }
@@ -135,7 +139,18 @@
   }
 }
 
+gfx::Size TextButtonDefaultBorder::GetMinimumSize() const {
+  gfx::Size size;
+  if (normal_painter_)
+    size.SetToMax(normal_painter_->GetMinimumSize());
+  if (hot_painter_)
+    size.SetToMax(hot_painter_->GetMinimumSize());
+  if (pushed_painter_)
+    size.SetToMax(pushed_painter_->GetMinimumSize());
+  return size;
+}
 
+
 // TextButtonNativeThemeBorder ------------------------------------------------
 
 TextButtonNativeThemeBorder::TextButtonNativeThemeBorder(