Add new UMA stats for parallelizable download

content/browser/download/download_job_impl.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/download_job_impl.h"
 
 #include "content/public/browser/web_contents.h"
 
 namespace content {
 
 DownloadJobImpl::DownloadJobImpl(
     DownloadItemImpl* download_item,
-    std::unique_ptr<DownloadRequestHandleInterface> request_handle)
-    : DownloadJob(download_item), request_handle_(std::move(request_handle)) {}
+    std::unique_ptr<DownloadRequestHandleInterface> request_handle,
+    bool is_parallizable)
+    : DownloadJob(download_item),
+      request_handle_(std::move(request_handle)),
+      is_parallizable_(is_parallizable) {}
 
 DownloadJobImpl::~DownloadJobImpl() = default;
 
 void DownloadJobImpl::Start() {
   DownloadJob::StartDownload();
 }
 
 void DownloadJobImpl::Cancel(bool user_cancel) {
   if (request_handle_)
     request_handle_->CancelRequest();
@@ skipping 11 matching lines @@
     return;
 
   if (request_handle_)
     request_handle_->ResumeRequest();
 }
 
 WebContents* DownloadJobImpl::GetWebContents() const {
   return request_handle_ ? request_handle_->GetWebContents() : nullptr;
 }
 
+bool DownloadJobImpl::IsParallelizable() const {
+  return is_parallizable_;
+}
+
 }  // namespace content