Setup field trial for one-click signin inforbar.

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

Index: chrome/browser/ui/views/infobars/infobar_background.h
diff --git a/chrome/browser/ui/views/infobars/infobar_background.h b/chrome/browser/ui/views/infobars/infobar_background.h
index 3c8367fc60fb8d9df626d74c439976e6ee60a6ba..613c014ff7e885e2e6202b28c8b84cb7bd3de416 100644
--- a/chrome/browser/ui/views/infobars/infobar_background.h
+++ b/chrome/browser/ui/views/infobars/infobar_background.h
@@ -12,11 +12,14 @@
 class InfoBarBackground : public views::Background {
  public:
   explicit InfoBarBackground(InfoBarDelegate::Type infobar_type);
+  InfoBarBackground(SkColor top, SkColor bottom);
   virtual ~InfoBarBackground();
 
   void set_separator_color(SkColor color) { separator_color_ = color; }
 
  private:
+  void Init();
+
   // views::Background:
   virtual void Paint(gfx::Canvas* canvas, views::View* view) const OVERRIDE;