ios: add CrNet

ios/crnet/crnet_net_log.cc

Index: ios/crnet/crnet_net_log.cc
diff --git a/ios/crnet/crnet_net_log.cc b/ios/crnet/crnet_net_log.cc
new file mode 100644
index 0000000000000000000000000000000000000000..4ad3d3057d7317d68f2f90f3f7bbb6c2b7dc090f
--- /dev/null
+++ b/ios/crnet/crnet_net_log.cc
@@ -0,0 +1,46 @@
+// Copyright 2015 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 "ios/crnet/crnet_net_log.h"
+
+#include "base/files/file_path.h"
+#include "base/files/file_util.h"
+#include "base/files/scoped_file.h"
+#include "base/values.h"
+#include "net/log/net_log.h"
+#include "net/log/net_log_util.h"
+#include "net/log/write_to_file_net_log_observer.h"
+
+CrNetNetLog::CrNetNetLog() { }
+CrNetNetLog::~CrNetNetLog() { }
+
+bool CrNetNetLog::Start(const base::FilePath& log_file,
+                        CrNetNetLog::Mode mode) {
+  DCHECK(thread_checker_.CalledOnValidThread());
+  base::FilePath temp_dir;
+  if (!base::GetTempDir(&temp_dir))
+    return false;
+
+  base::FilePath full_path = temp_dir.Append(log_file);
+  base::ScopedFILE file(base::OpenFile(full_path, "w"));
+  if (!file)
+    return false;
+
+  scoped_ptr<base::Value> constants(net::GetNetConstants().Pass());
+
+  net::NetLogCaptureMode capture_mode = mode == LOG_ALL_BYTES ?
+      net::NetLogCaptureMode::IncludeSocketBytes() :
+      net::NetLogCaptureMode::Default();
+  write_to_file_observer_.reset(new net::WriteToFileNetLogObserver());
+  write_to_file_observer_->set_capture_mode(capture_mode);
+  write_to_file_observer_->StartObserving(this, file.Pass(), constants.get(),
+                                          nullptr);
+  return true;
+}
+
+void CrNetNetLog::Stop() {
+  DCHECK(thread_checker_.CalledOnValidThread());
+  write_to_file_observer_->StopObserving(nullptr);
+  write_to_file_observer_.reset();
+}