Record the parallel download UMA for fresh new downloads

Start() can be called on both resumption and fresh new download
This CL records only the parallel downloads that are new

BUG=644352

Review-Url: https://codereview.chromium.org/2810133003
Cr-Commit-Position: refs/heads/master@{#464278}

content/browser/download/download_item_impl.cc

@@ -1224,6 +1224,9 @@ void DownloadItemImpl::Start(
   download_file_ = std::move(file);
   job_ = DownloadJobFactory::CreateJob(this, std::move(req_handle),
                                        new_create_info);
+  if (job_->UsesParallelRequests())
+    RecordParallelDownloadCount(START_COUNT);
+
   deferred_interrupt_reason_ = DOWNLOAD_INTERRUPT_REASON_NONE;
 
   if (state_ == CANCELLED_INTERNAL) {
@@ -1273,6 +1276,8 @@ void DownloadItemImpl::Start(
 
   if (state_ == INITIAL_INTERNAL) {
     RecordDownloadCount(NEW_DOWNLOAD_COUNT);
+    if (job_->UsesParallelRequests())
+      RecordParallelDownloadCount(NEW_DOWNLOAD_COUNT);
     RecordDownloadMimeType(mime_type_);
     if (!GetBrowserContext()->IsOffTheRecord()) {
       RecordDownloadCount(NEW_DOWNLOAD_COUNT_NORMAL_PROFILE);
@@ -1287,9 +1292,6 @@ void DownloadItemImpl::Start(
   if (state_ == RESUMING_INTERNAL)
     UpdateValidatorsOnResumption(new_create_info);
 
-  if (state_ == INITIAL_INTERNAL && job_->UsesParallelRequests())
-    RecordParallelDownloadCount(START_COUNT);
-
   TransitionTo(TARGET_PENDING_INTERNAL);
 
   job_->Start();