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

ui/views/controls/button/text_button.h

Index: ui/views/controls/button/text_button.h
===================================================================
--- ui/views/controls/button/text_button.h	(revision 236640)
+++ ui/views/controls/button/text_button.h	(working copy)
@@ -31,6 +31,7 @@
 
   // Border:
   virtual gfx::Insets GetInsets() const OVERRIDE;
+  virtual gfx::Size GetMinimumSize() const OVERRIDE;
 
  private:
   // Border:
@@ -62,6 +63,7 @@
  private:
   // TextButtonBorder:
   virtual void Paint(const View& view, gfx::Canvas* canvas) OVERRIDE;
+  virtual gfx::Size GetMinimumSize() const OVERRIDE;
 
   scoped_ptr<Painter> normal_painter_;
   scoped_ptr<Painter> hot_painter_;
@@ -83,6 +85,8 @@
 
   // TextButtonBorder:
   virtual void Paint(const View& view, gfx::Canvas* canvas) OVERRIDE;
+  // We don't override GetMinimumSize(), since there's no easy way to calculate
+  // the minimum size required by the various theme components.
 
  private:
   // The delegate the controls the appearance of this border.