Add support to previews/ for Server LoFi and LitePages

components/previews/core/previews_black_list.cc

 // 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.
 
 #include "components/previews/core/previews_black_list.h"
 
 #include "base/bind.h"
 #include "base/memory/ptr_util.h"
 #include "base/metrics/histogram_macros.h"
 #include "base/optional.h"
@@ skipping 57 matching lines @@
 }
 
 PreviewsBlackList::~PreviewsBlackList() {}
 
 void PreviewsBlackList::AddPreviewNavigation(const GURL& url,
                                              bool opt_out,
                                              PreviewsType type) {
   DCHECK(thread_checker_.CalledOnValidThread());
   DCHECK(url.has_host());
   switch (type) {
+    case PreviewsType::LITE_PAGE:
+      UMA_HISTOGRAM_BOOLEAN("Previews.OptOut.UserOptedOut.LitePage", opt_out);
+      break;
+    case PreviewsType::SERVER_LOFI:
+      UMA_HISTOGRAM_BOOLEAN("Previews.OptOut.UserOptedOut.ServerLoFi", opt_out);
+      break;
     case PreviewsType::OFFLINE:
       UMA_HISTOGRAM_BOOLEAN("Previews.OptOut.UserOptedOut.Offline", opt_out);
       break;
-    default:
+    case PreviewsType::NONE:
+    case PreviewsType::LAST:
       NOTREACHED();
   }
   if (opt_out) {
     last_opt_out_time_ = clock_->Now();
   }
   // If the |black_list_item_map_| has been loaded from |opt_out_store_|,
   // synchronous operations will be accurate. Otherwise, queue the task to run
   // asynchronously.
   if (loaded_) {
     AddPreviewNavigationSync(url, opt_out, type);
@@ skipping 129 matching lines @@
 // static
 std::unique_ptr<PreviewsBlackListItem>
 PreviewsBlackList::CreateHostIndifferentBlackListItem() {
   return base::MakeUnique<PreviewsBlackListItem>(
       params::MaxStoredHistoryLengthForHostIndifferentBlackList(),
       params::HostIndifferentBlackListOptOutThreshold(),
       params::HostIndifferentBlackListPerHostDuration());
 }
 
 }  // namespace previews