Add support for painting halos on Views Labels.

ui/views/examples/label_example.cc

Index: ui/views/examples/label_example.cc
diff --git a/ui/views/examples/label_example.cc b/ui/views/examples/label_example.cc
index 239b4db95f27ec9d4d0d6cd237a8d8ddf29bff86..83dd9227ceb8d50848995e7c69909c9c1ca6110d 100644
--- a/ui/views/examples/label_example.cc
+++ b/ui/views/examples/label_example.cc
@@ -68,10 +68,11 @@ void LabelExample::CreateExampleView(View* container) {
   label->SetEnabledColor(SK_ColorBLUE);
   container->AddChildView(label);
 
-  label = new Label(ASCIIToUTF16("A Courier-18 label with a shadow."));
+  label = new Label(ASCIIToUTF16("A Courier-18 label with a halo and shadow."));
   label->SetFontList(gfx::FontList("Courier, 18px"));
   label->SetShadowColors(SK_ColorGRAY, SK_ColorLTGRAY);
-  label->SetShadowOffset(1, 1);
+  label->SetShadowOffset(2, 2);
+  label->set_halo_color(SK_ColorGREEN);
   container->AddChildView(label);
 
   label = new PreferredSizeLabel();