[Downloads] Some UMA for downloads resumption.

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 1366 matching lines @@
   // won't download any more data.  However, a) there are currently no
   // continuable errors that can occur after we download all the data, and
   // b) if there were, that would probably simply result in a null range
   // request, which would generate a DestinationCompleted() notification
   // from the DownloadFile, which would behave properly with setting
   // all_data_saved_ to false here.
   all_data_saved_ = false;
 
   TransitionTo(INTERRUPTED_INTERNAL, DONT_UPDATE_OBSERVERS);
   RecordDownloadInterrupted(reason, received_bytes_, total_bytes_);
+  if (!GetWebContents())
+    RecordDownloadCount(INTERRUPTED_WITHOUT_WEBCONTENTS);
 
   AutoResumeIfValid();
   UpdateObservers();
 }
 
 void DownloadItemImpl::ReleaseDownloadFile(bool destroy_file) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 
   if (destroy_file) {
     BrowserThread::PostTask(
@@ skipping 285 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