Update base/timer.h code to pass through Location from call sites.

content/browser/download/download_item.cc

 // Copyright (c) 2011 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.
 
 #include "content/browser/download/download_item.h"
 
 #include "base/basictypes.h"
 #include "base/file_util.h"
 #include "base/format_macros.h"
 #include "base/i18n/case_conversion.h"
@@ skipping 308 matching lines @@
   // revert to 'unknown size mode'.
   if (received_bytes_ > total_bytes_)
     total_bytes_ = 0;
 }
 
 void DownloadItem::StartProgressTimer() {
   // TODO(rdsmith): Change to DCHECK after http://crbug.com/85408 resolved.
   CHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 
   update_timer_.Start(base::TimeDelta::FromMilliseconds(kUpdateTimeMs), this,
-                      &DownloadItem::UpdateObservers);
+                      &DownloadItem::UpdateObservers, FROM_HERE);
 }
 
 void DownloadItem::StopProgressTimer() {
   // TODO(rdsmith): Change to DCHECK after http://crbug.com/85408 resolved.
   CHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 
   update_timer_.Stop();
 }
 
 // Updates from the download thread may have been posted while this download
@@ skipping 456 matching lines @@
         state_info_.target_name.value().c_str(),
         full_path().value().c_str());
   } else {
     description += base::StringPrintf(" url = \"%s\"", url_list.c_str());
   }
 
   description += " }";
 
   return description;
 }