Hooked up NetLog to DownloadItem, DownloadFile, and FileStream.

content/browser/tab_contents/web_drag_source_mac.mm

 // 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.
 
 #import "content/browser/tab_contents/web_drag_source_mac.h"
 
 #include <sys/param.h>
 
 #include "base/bind.h"
 #include "base/file_path.h"
 #include "base/pickle.h"
 #include "base/string_util.h"
 #include "base/sys_string_conversions.h"
 #include "base/threading/thread.h"
 #include "base/threading/thread_restrictions.h"
 #include "base/utf_string_conversions.h"
 #include "content/browser/browser_thread_impl.h"
 #include "content/browser/download/drag_download_file.h"
 #include "content/browser/download/drag_download_util.h"
 #include "content/browser/renderer_host/render_view_host.h"
 #include "content/browser/tab_contents/tab_contents.h"
 #include "content/public/browser/content_browser_client.h"
+#include "content/public/common/content_client.h"
 #include "content/public/common/url_constants.h"
 #include "net/base/file_stream.h"
 #include "net/base/net_util.h"
 #include "ui/base/clipboard/custom_data_helper.h"
 #include "ui/gfx/mac/nsimage_cache.h"
 #include "webkit/glue/webdropdata.h"
 
 using base::SysNSStringToUTF8;
 using base::SysUTF8ToNSString;
 using base::SysUTF16ToNSString;
@@ skipping 283 matching lines @@
   FilePath fileName = downloadFileName_.empty() ?
       GetFileNameFromDragData(*dropData_) : downloadFileName_;
   FilePath filePath(SysNSStringToUTF8(path));
   filePath = filePath.Append(fileName);
 
   // CreateFileStreamForDrop() will call file_util::PathExists(),
   // which is blocking.  Since this operation is already blocking the
   // UI thread on OSX, it should be reasonable to let it happen.
   base::ThreadRestrictions::ScopedAllowIO allowIO;
   FileStream* fileStream =
-      drag_download_util::CreateFileStreamForDrop(&filePath);
+      drag_download_util::CreateFileStreamForDrop(
+          &filePath, content::GetContentClient()->browser()->GetNetLog());
   if (!fileStream)
     return nil;
 
   if (downloadURL_.is_valid()) {
     scoped_refptr<DragDownloadFile> dragFileDownloader(new DragDownloadFile(
         filePath,
         linked_ptr<net::FileStream>(fileStream),
         downloadURL_,
         contents_->GetURL(),
         contents_->GetEncoding(),
@@ skipping 103 matching lines @@
 
 - (NSImage*)dragImage {
   if (dragImage_)
     return dragImage_;
 
   // Default to returning a generic image.
   return gfx::GetCachedImageWithName(@"nav.pdf");
 }
 
 @end  // @implementation WebDragSource (Private)