Adding the Previews infobar to pages that show a client LoFi image

chrome/browser/previews/previews_infobar_delegate.h

 // Copyright 2016 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_PREVIEWS_PREVIEWS_INFOBAR_DELEGATE_H_
 #define CHROME_BROWSER_PREVIEWS_PREVIEWS_INFOBAR_DELEGATE_H_
 
 #include "base/callback.h"
 #include "base/strings/string16.h"
 #include "components/infobars/core/confirm_infobar_delegate.h"
 
 namespace content {
 class WebContents;
 }
 
 // Shows an infobar that lets the user know that a preview page has been loaded,
 // and gives the user a link to reload the original page. This infobar will only
 // be shown once per page load. Records UMA data for user interactions with the
 // infobar.
 class PreviewsInfoBarDelegate : public ConfirmInfoBarDelegate {
  public:
   // The type of the infobar. It controls the strings and what UMA data is
   // recorded for the infobar.
+  // TODO(ryansturm): Combine PreviewsInfoBarType with previews::PreviewsType.
+  // crbug.com/704335
   enum PreviewsInfoBarType {
-    LOFI,      // Server-side image replacement.
-    LITE_PAGE, // Server-side page rewrite.
-    OFFLINE,   // Offline copy of the page.
+    LOFI,       // Image placeholders (both server and client implementations).
+    LITE_PAGE,  // Server-side page rewrite.
+    OFFLINE,    // Offline copy of the page.
   };
 
   typedef base::Callback<void(bool opt_out)> OnDismissPreviewsInfobarCallback;
 
   // Actions on the previews infobar. This enum must remain synchronized with
   // the enum of the same name in metrics/histograms/histograms.xml.
   enum PreviewsInfoBarAction {
     INFOBAR_SHOWN = 0,
     INFOBAR_LOAD_ORIGINAL_CLICKED = 1,
     INFOBAR_DISMISSED_BY_USER = 2,
@@ skipping 34 matching lines @@
   mutable PreviewsInfoBarAction infobar_dismissed_action_;
 
   const base::string16 message_text_;
 
   OnDismissPreviewsInfobarCallback on_dismiss_callback_;
 
   DISALLOW_COPY_AND_ASSIGN(PreviewsInfoBarDelegate);
 };
 
 #endif  // CHROME_BROWSER_PREVIEWS_PREVIEWS_INFOBAR_DELEGATE_H_