Views: Add new SetFocusBehavior method.

ui/views/controls/button/custom_button.h

Index: ui/views/controls/button/custom_button.h
diff --git a/ui/views/controls/button/custom_button.h b/ui/views/controls/button/custom_button.h
index afcefbe9bf8441fc06fb3b4d6b8c7a0576a153ef..11136a619f68de83a2d709446a0c6ade5fed57c5 100644
--- a/ui/views/controls/button/custom_button.h
+++ b/ui/views/controls/button/custom_button.h
@@ -20,8 +20,8 @@ class InkDropDelegate;
 
 // A button with custom rendering. The base of ImageButton and LabelButton.
 // Note that this type of button is not focusable by default and will not be
-// part of the focus chain.  Call SetFocusable(true) to make it part of the
-// focus chain.
+// part of the focus chain.  Call SetFocusBehavior(FocusBehavior::ALWAYS) to
+// make it part of the focus chain.
 class VIEWS_EXPORT CustomButton : public Button, public gfx::AnimationDelegate {
  public:
   // An enum describing the events on which a button should notify its listener.