Add InfoBar delegate for previews

components/infobars/core/infobar_delegate.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 COMPONENTS_INFOBARS_CORE_INFOBAR_DELEGATE_H_
 #define COMPONENTS_INFOBARS_CORE_INFOBAR_DELEGATE_H_
 
 #include "base/macros.h"
 #include "base/strings/string16.h"
 #include "build/build_config.h"
@@ skipping 116 matching lines @@
     READER_MODE_INFOBAR_DELEGATE_IOS = 57,
     SYNC_ERROR_INFOBAR_DELEGATE = 58,
     UPGRADE_INFOBAR_DELEGATE_IOS = 59,
     CHROME_WINDOW_ERROR = 60,
     CONFIRM_DANGEROUS_DOWNLOAD = 61,
     // Removed: DESKTOP_SEARCH_REDIRECTION_INFOBAR_DELEGATE = 62,
     UPDATE_PASSWORD_INFOBAR_DELEGATE = 63,
     DATA_REDUCTION_PROMO_INFOBAR_DELEGATE_ANDROID = 64,
     AUTOFILL_CREDIT_CARD_FILLING_INFOBAR_DELEGATE_ANDROID = 65,
     SUBRESOURCE_FILTER_INFOBAR_DELEGATE_ANDROID = 66,
+    DATA_REDUCTION_PROXY_PREVIEW_INFOBAR_DELEGATE = 67,

[gone, 2016/08/30 22:54:06]

Corresponding histograms.xml change?

[megjablon, 2016/08/30 23:48:33]

Done.

   };
 
   // Describes navigation events, used to decide whether infobars should be
   // dismissed.
   struct NavigationDetails {
     // Unique identifier for the entry.
     int entry_id;
     // True if it is a navigation to a different page (as opposed to in-page).
     bool is_navigation_to_different_page;
     // True if the entry replaced the existing one.
@@ skipping 87 matching lines @@
 
   // The ID of the active navigation entry at the time we became owned.
   int nav_entry_id_;
 
   DISALLOW_COPY_AND_ASSIGN(InfoBarDelegate);
 };
 
 }  // namespace infobars
 
 #endif  // COMPONENTS_INFOBARS_CORE_INFOBAR_DELEGATE_H_