Add SetProminent() to MdTextButton to create blue buttons.

chrome/browser/ui/libgtk2ui/native_theme_gtk2.cc

 // Copyright (c) 2013 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.
 
 #include "chrome/browser/ui/libgtk2ui/native_theme_gtk2.h"
 
 #include <gtk/gtk.h>
 
 #include "chrome/browser/ui/libgtk2ui/chrome_gtk_frame.h"
 #include "chrome/browser/ui/libgtk2ui/chrome_gtk_menu_subclasses.h"
@@ skipping 307 matching lines @@
       return GetTextColor(GetButton(), PRELIGHT);
     case kColorId_BlueButtonHoverColor:
       return GetTextColor(GetBlueButton(), PRELIGHT);
     case kColorId_ButtonHoverBackgroundColor:
       return GetBGColor(GetButton(), PRELIGHT);
     case kColorId_BlueButtonPressedColor:
       return GetTextColor(GetBlueButton(), ACTIVE);
     case kColorId_BlueButtonShadowColor:
       return SK_ColorTRANSPARENT;
       // return GetTextColor(GetButton(), NORMAL);
-    case kColorId_CallToActionColor:
+    case kColorId_ProminentButtonColor:
       return GetSystemColor(kColorId_LinkEnabled);
-    case kColorId_TextOnCallToActionColor:
+    case kColorId_TextOnProminentButtonColor:
       return GetTextColor(GetLabel(), SELECTED);
     case kColorId_ButtonPressedShade:
       return SK_ColorTRANSPARENT;
 
     // Textfield
     case kColorId_TextfieldDefaultColor:
       return GetTextColor(GetEntry(), NORMAL);
     case kColorId_TextfieldDefaultBackground:
       return GetBaseColor(GetEntry(), NORMAL);
 
@@ skipping 243 matching lines @@
 
   if (!fake_menu_item) {
     fake_menu_item = gtk_custom_menu_item_new();
     gtk_menu_shell_append(GTK_MENU_SHELL(GetMenu()), fake_menu_item);
   }
 
   return fake_menu_item;
 }
 
 }  // namespace libgtk2ui