Roll Chrome into Mojo.

net/base/file_stream_context_win.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_context.h"
 
 #include <windows.h>
 
 #include "base/files/file_path.h"
 #include "base/logging.h"
 #include "base/metrics/histogram.h"
+#include "base/profiler/scoped_tracker.h"
 #include "base/task_runner.h"
 #include "net/base/io_buffer.h"
 #include "net/base/net_errors.h"
 
 namespace net {
 
 namespace {
 
 void SetOffset(OVERLAPPED* overlapped, const LARGE_INTEGER& offset) {
   overlapped->Offset = offset.LowPart;
@@ skipping 33 matching lines @@
     OnFileOpened();
   }
 }
 
 FileStream::Context::~Context() {
 }
 
 int FileStream::Context::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::Context::Read"));
+
   DCHECK(!async_in_progress_);
 
   DWORD bytes_read;
   if (!ReadFile(file_.GetPlatformFile(), buf->data(), buf_len,
                 &bytes_read, &io_context_.overlapped)) {
     IOResult error = IOResult::FromOSError(GetLastError());
     if (error.os_error == ERROR_HANDLE_EOF)
       return 0;  // Report EOF by returning 0 bytes read.
     if (error.os_error == ERROR_IO_PENDING)
       IOCompletionIsPending(callback, buf);
@@ skipping 79 matching lines @@
   }
 
   CompletionCallback temp_callback = callback_;
   callback_.Reset();
   scoped_refptr<IOBuffer> temp_buf = in_flight_buf_;
   in_flight_buf_ = NULL;
   temp_callback.Run(result);
 }
 
 }  // namespace net