[Autofill] Tweak credit card signin promo visually.

chrome/browser/ui/views/autofill/autofill_popup_base_view.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_UI_VIEWS_AUTOFILL_AUTOFILL_POPUP_BASE_VIEW_H_
 #define CHROME_BROWSER_UI_VIEWS_AUTOFILL_AUTOFILL_POPUP_BASE_VIEW_H_
 
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "base/time/time.h"
@@ skipping 15 matching lines @@
 // Class that deals with the event handling for Autofill-style popups. This
 // class should only be instantiated by sub-classes.
 class AutofillPopupBaseView : public views::WidgetDelegateView,
                               public views::WidgetFocusChangeListener,
                               public views::WidgetObserver {
  public:
   static const SkColor kBorderColor;
   static const SkColor kHoveredBackgroundColor;
   static const SkColor kItemTextColor;
   static const SkColor kPopupBackground;
+  static const SkColor kPromoPopupBackground;
   static const SkColor kValueTextColor;
   static const SkColor kWarningTextColor;
 
  protected:
   explicit AutofillPopupBaseView(AutofillPopupViewDelegate* delegate,
                                  views::Widget* parent_widget);
   ~AutofillPopupBaseView() override;
 
   // Show this popup. Idempotent.
   void DoShow();
@@ skipping 48 matching lines @@
   base::Time show_time_;
 
   base::WeakPtrFactory<AutofillPopupBaseView> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(AutofillPopupBaseView);
 };
 
 }  // namespace autofill
 
 #endif  // CHROME_BROWSER_UI_VIEWS_AUTOFILL_AUTOFILL_POPUP_BASE_VIEW_H_