Add more UMA to record whether parallel download is completed/interrupted/cancelled

content/browser/download/download_item_impl.cc

Index: content/browser/download/download_item_impl.cc
diff --git a/content/browser/download/download_item_impl.cc b/content/browser/download/download_item_impl.cc
index 507ace3f58836cc192837a19cf459b4915197981..d6e17e8594135dfac607769d7fe74c651373e07c 100644
--- a/content/browser/download/download_item_impl.cc
+++ b/content/browser/download/download_item_impl.cc
@@ -1273,7 +1273,7 @@ void DownloadItemImpl::Start(
     UpdateValidatorsOnResumption(new_create_info);
 
   if (state_ == INITIAL_INTERNAL && job_->UsesParallelRequests())
-    RecordDownloadCount(USES_PARALLEL_REQUESTS);
+    RecordParallelDownloadCount(PARALLEL_DOWNLOAD_START_COUNT);
 
   TransitionTo(TARGET_PENDING_INTERNAL);
 
@@ -1563,6 +1563,8 @@ void DownloadItemImpl::Completed() {
   end_time_ = base::Time::Now();
   TransitionTo(COMPLETE_INTERNAL);
   RecordDownloadCompleted(start_tick_, received_bytes_);
+  if (job_ && job_->UsesParallelRequests())
+    RecordParallelDownloadCount(PARALLEL_DOWNLOAD_COMPLETED_COUNT);
 
   if (auto_opened_) {
     // If it was already handled by the delegate, do nothing.
@@ -1693,11 +1695,14 @@ void DownloadItemImpl::InterruptWithPartialState(
     }
 
     RecordDownloadCount(CANCELLED_COUNT);
+    if (job_ && job_->UsesParallelRequests())
+      RecordParallelDownloadCount(PARALLEL_DOWNLOAD_CANCELLED_COUNT);
     TransitionTo(CANCELLED_INTERNAL);
     return;
   }
 
-  RecordDownloadInterrupted(reason, received_bytes_, total_bytes_);
+  RecordDownloadInterrupted(reason, received_bytes_, total_bytes_,
+                            job_ && job_->UsesParallelRequests());
   if (!GetWebContents())
     RecordDownloadCount(INTERRUPTED_WITHOUT_WEBCONTENTS);