Repaint ImageButton when image is changed.

ui/views/controls/button/image_button.cc

Index: ui/views/controls/button/image_button.cc
diff --git a/ui/views/controls/button/image_button.cc b/ui/views/controls/button/image_button.cc
index e9d4f36c92bee7283cc41fba93c008757c0aa014..fdaa27530d547647f5e46810d45a55aaa70ea86b 100644
--- a/ui/views/controls/button/image_button.cc
+++ b/ui/views/controls/button/image_button.cc
@@ -47,9 +47,11 @@ const gfx::ImageSkia& ImageButton::GetImage(ButtonState state) const {
   return images_[state];
 }
 
-void ImageButton::SetImage(ButtonState state, const gfx::ImageSkia* image) {
-  images_[state] = image ? *image : gfx::ImageSkia();
+void ImageButton::SetImage(ButtonState for_state, const gfx::ImageSkia* image) {
+  images_[for_state] = image ? *image : gfx::ImageSkia();
   PreferredSizeChanged();
+  if (state() == for_state)
+    SchedulePaint();
 }
 
 void ImageButton::SetBackground(SkColor color,