Allow TextButton derivatives to override drawing of certain parts.

ui/views/controls/button/text_button.cc

Index: ui/views/controls/button/text_button.cc
diff --git a/ui/views/controls/button/text_button.cc b/ui/views/controls/button/text_button.cc
index 99ac86b51dccfe1155ce09e8e82836a87b3081e9..75dfd1b6e396d3fb52e51170f87a3075b2a4d4cd 100644
--- a/ui/views/controls/button/text_button.cc
+++ b/ui/views/controls/button/text_button.cc
@@ -445,6 +445,10 @@ void TextButtonBase::PaintButton(gfx::Canvas* canvas, PaintButtonMode mode) {
     Painter::PaintFocusPainter(this, canvas, focus_painter_.get());
   }
 
+  OnPaintText(canvas, mode);
+}
+
+void TextButtonBase::OnPaintText(gfx::Canvas* canvas, PaintButtonMode mode) {
   gfx::Rect text_bounds(GetTextBounds());
   if (text_bounds.width() > 0) {
     // Because the text button can (at times) draw multiple elements on the
@@ -630,7 +634,10 @@ void TextButton::PaintButton(gfx::Canvas* canvas, PaintButtonMode mode) {
       set_alignment(ALIGN_RIGHT);
 
   TextButtonBase::PaintButton(canvas, mode);
+  OnPaintIcon(canvas, mode);
+}
 
+void TextButton::OnPaintIcon(gfx::Canvas* canvas, PaintButtonMode mode) {
   const gfx::ImageSkia& icon = GetImageToPaint();
 
   if (icon.width() > 0) {