Roll Chrome into Mojo.

net/base/file_stream.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.
 
 #include "net/base/file_stream.h"
 
+#include "base/profiler/scoped_tracker.h"
 #include "net/base/file_stream_context.h"
 #include "net/base/net_errors.h"
 
 namespace net {
 
 FileStream::FileStream(const scoped_refptr<base::TaskRunner>& task_runner)
     : context_(new Context(task_runner)) {
 }
 
 FileStream::FileStream(base::File file,
@@ skipping 32 matching lines @@
   if (!IsOpen())
     return ERR_UNEXPECTED;
 
   context_->Seek(whence, offset, callback);
   return ERR_IO_PENDING;
 }
 
 int FileStream::Read(IOBuffer* buf,
                      int buf_len,
                      const CompletionCallback& callback) {
+  // TODO(vadimt): Remove ScopedTracker below once crbug.com/423948 is fixed.
+  tracked_objects::ScopedTracker tracking_profile(
+      FROM_HERE_WITH_EXPLICIT_FUNCTION("423948 FileStream::Read"));
+
   if (!IsOpen())
     return ERR_UNEXPECTED;
 
   // read(..., 0) will return 0, which indicates end-of-file.
   DCHECK_GT(buf_len, 0);
 
   return context_->Read(buf, buf_len, callback);
 }
 
 int FileStream::Write(IOBuffer* buf,
@@ skipping 12 matching lines @@
 
   context_->Flush(callback);
   return ERR_IO_PENDING;
 }
 
 const base::File& FileStream::GetFileForTesting() const {
   return context_->file();
 }
 
 }  // namespace net