Setup field trial for one-click signin inforbar.

chrome/browser/ui/views/infobars/confirm_infobar.h

Index: chrome/browser/ui/views/infobars/confirm_infobar.h
diff --git a/chrome/browser/ui/views/infobars/confirm_infobar.h b/chrome/browser/ui/views/infobars/confirm_infobar.h
index 35835470496ad5170dc3883de0cc1f2c9d9e2ab2..02cf70e302934cdb75f91d1dff1e280c0e23b304 100644
--- a/chrome/browser/ui/views/infobars/confirm_infobar.h
+++ b/chrome/browser/ui/views/infobars/confirm_infobar.h
@@ -25,9 +25,11 @@ class ConfirmInfoBar : public InfoBarView,
  public:
   ConfirmInfoBar(InfoBarTabHelper* owner, ConfirmInfoBarDelegate* delegate);
 
- private:
+ protected:
   virtual ~ConfirmInfoBar();
 
+  views::TextButton* ok_button() { return ok_button_; }
+
   // InfoBarView:
   virtual void Layout() OVERRIDE;
   virtual void ViewHierarchyChanged(bool is_add,
@@ -40,6 +42,7 @@ class ConfirmInfoBar : public InfoBarView,
   // views::LinkListener:
   virtual void LinkClicked(views::Link* source, int event_flags) OVERRIDE;
 
+ private:
   ConfirmInfoBarDelegate* GetDelegate();
 
   views::Label* label_;