[Sync] Simplify GetSessionName interface

chrome/browser/sync/util/get_session_name.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 "chrome/browser/sync/util/get_session_name.h"
+
+#include "base/bind.h"
+#include "base/bind_helpers.h"
+#include "base/callback.h"
+#include "base/location.h"
+#include "base/message_loop_proxy.h"
+#include "base/sys_info.h"
+
+#if defined(OS_LINUX)
+#include "base/linux_util.h"
+#elif defined(OS_WIN)
+#include <windows.h>
+#endif
+
+namespace browser_sync {
+
+#if defined(OS_WIN)
+std::string GetComputerName() {
+  char computer_name[MAX_COMPUTERNAME_LENGTH + 1];
+  DWORD size = sizeof(computer_name);
+  if (GetComputerNameA(computer_name, &size))
+    return computer_name;
+  return std::string();
+}
+#endif
+
+namespace {
+
+void DoGetSessionNameTask(std::string* session_name) {
+#if defined(OS_CHROMEOS)
+  *session_name = "Chromebook";
+#elif defined(OS_LINUX)
+  *session_name = base::GetLinuxDistro();
+#elif defined(OS_MACOSX)
+  *session_name = GetSessionNameTask::GetHardwareModelName();
+#elif defined(OS_WIN)
+  *session_name = GetSessionNameTask::GetComputerName();
+#else
+  session_name->clear();
+#endif
+
+  if (*session_name == "Unknown" || session_name->empty())
+    *session_name = base::SysInfo::OperatingSystemName();
+}
+
+void GetSessionNameReply(
+    const base::Callback<void(const std::string&)>& done_callback,
+    std::string* session_name) {
+  done_callback.Run(*session_name);
+}
+
+}  // namespace
+
+void GetSessionName(
+    const scoped_refptr<base::TaskRunner>& task_runner,
+    const base::Callback<void(const std::string&)>& done_callback) {
+  std::string* session_name = new std::string();
+  task_runner->PostTaskAndReply(
+      FROM_HERE,
+      base::Bind(&DoGetSessionNameTask,
+                 base::Unretained(session_name)),
+      base::Bind(&GetSessionNameReply,
+                 done_callback,
+                 base::Owned(session_name)));
+}
+
+}  // namespace browser_sync