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

content/browser/download/download_item_impl.cc

 // Copyright (c) 2012 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.
 
 // File method ordering: Methods in this file are in the same order as
 // in download_item_impl.h, with the following exception: The public
 // interface Start is placed in chronological order with the other
 // (private) routines that together define a DownloadItem's state
 // transitions as the download progresses.  See "Download progression
 // cascade" later in this file.
@@ skipping 1255 matching lines @@
   }
 
   // Successful download start.
   DCHECK(download_file_);
   DCHECK(job_);
 
   if (state_ == RESUMING_INTERNAL)
     UpdateValidatorsOnResumption(new_create_info);
 
   if (state_ == INITIAL_INTERNAL && job_->UsesParallelRequests())
-    RecordDownloadCount(USES_PARALLEL_REQUESTS);
+    RecordParallelDownloadCount(PARALLEL_DOWNLOAD_START_COUNT);
 
   TransitionTo(TARGET_PENDING_INTERNAL);
 
   job_->Start();
 }
 
 void DownloadItemImpl::StartDownload() {
   BrowserThread::PostTask(
       BrowserThread::FILE, FROM_HERE,
       base::Bind(&DownloadFile::Initialize,
@@ skipping 269 matching lines @@
 
 void DownloadItemImpl::Completed() {
   DCHECK_CURRENTLY_ON(BrowserThread::UI);
 
   DVLOG(20) << __func__ << "() " << DebugString(false);
 
   DCHECK(all_data_saved_);
   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.
   } else if (GetOpenWhenComplete() ||
              ShouldOpenFileBasedOnExtension() ||
              IsTemporary()) {
     // If the download is temporary, like in drag-and-drop, do not open it but
     // we still need to set it auto-opened so that it can be removed from the
     // download shelf.
     if (!IsTemporary())
@@ skipping 110 matching lines @@
       reason == DOWNLOAD_INTERRUPT_REASON_USER_SHUTDOWN) {
     if (IsDangerous()) {
       RecordDangerousDownloadDiscard(
           reason == DOWNLOAD_INTERRUPT_REASON_USER_CANCELED
               ? DOWNLOAD_DISCARD_DUE_TO_USER_ACTION
               : DOWNLOAD_DISCARD_DUE_TO_SHUTDOWN,
           GetDangerType(), GetTargetFilePath());
     }
 
     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);
 
   TransitionTo(INTERRUPTED_INTERNAL);
   AutoResumeIfValid();
 }
 
 void DownloadItemImpl::UpdateProgress(
     int64_t bytes_so_far,
     int64_t bytes_per_sec) {
@@ skipping 464 matching lines @@
     case RESUME_MODE_USER_CONTINUE:
       return "USER_CONTINUE";
     case RESUME_MODE_USER_RESTART:
       return "USER_RESTART";
   }
   NOTREACHED() << "Unknown resume mode " << mode;
   return "unknown";
 }
 
 }  // namespace content