Add new UMA stats for parallelizable download

content/browser/download/parallel_download_utils.cc

 // Copyright 2017 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 "content/browser/download/parallel_download_utils.h"
 
 #include "base/metrics/field_trial_params.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/time/time.h"
 #include "content/public/browser/download_save_info.h"
@@ skipping 149 matching lines @@
 }
 
 void DebugSlicesInfo(const DownloadItem::ReceivedSlices& slices) {
   DVLOG(1) << "Received slices size : " << slices.size();
   for (const auto& it : slices) {
     DVLOG(1) << "Slice offset = " << it.offset
              << " , received_bytes = " << it.received_bytes;
   }
 }
 
-CONTENT_EXPORT int64_t GetMaxContiguousDataBlockSizeFromBeginning(
+int64_t GetMaxContiguousDataBlockSizeFromBeginning(
     const DownloadItem::ReceivedSlices& slices) {
   std::vector<DownloadItem::ReceivedSlice>::const_iterator iter =
       slices.begin();
 
   int64_t size = 0;
   while (iter != slices.end() && iter->offset == size) {
     size += iter->received_bytes;
     iter++;
   }
   return size;
 }
 
+bool IsParallelDownloadEnabled() {
+  return base::FeatureList::IsEnabled(features::kParallelDownloading);
+}
+
 }  // namespace content