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diff --git a/base/logging.cc b/base/logging.cc
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+// Copyright 2008, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//    * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//    * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//    * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#include <ctime>
+#include <iomanip>
+#include <cstring>
+#include <windows.h>
+#include <algorithm>
+#include "base/base_switches.h"
+#include "base/command_line.h"
+#include "base/lock_impl.h"
+#include "base/logging.h"
+
+namespace logging {
+
+bool g_enable_dcheck = false;
+
+const char* const log_severity_names[LOG_NUM_SEVERITIES] = {
+  "INFO", "WARNING", "ERROR", "FATAL" };
+
+int min_log_level = 0;
+LogLockingState lock_log_file = LOCK_LOG_FILE;
+LoggingDestination logging_destination = LOG_ONLY_TO_FILE;
+
+const int kMaxFilteredLogLevel = LOG_WARNING;
+char* log_filter_prefix = NULL;
+
+// which log file to use? This is initialized by InitLogging or
+// will be lazily initialized to the default value when it is
+// first needed.
+wchar_t log_file_name[MAX_PATH] = { 0 };
+
+// this file is lazily opened and the handle may be NULL
+HANDLE log_file = NULL;
+
+// what should be prepended to each message?
+bool log_process_id = false;
+bool log_thread_id = false;
+bool log_timestamp = true;
+bool log_tickcount = false;
+
+// An assert handler override specified by the client to be called instead of
+// the debug message dialog.
+LogAssertHandlerFunction log_assert_handler = NULL;
+
+// The lock is used if log file locking is false. It helps us avoid problems
+// with multiple threads writing to the log file at the same time.  Use
+// LockImpl directly instead of using Lock, because Lock makes logging calls.
+static LockImpl* log_lock = NULL;
+
+// When we don't use a lock, we are using a global mutex. We need to do this
+// because LockFileEx is not thread safe.
+HANDLE log_mutex = NULL;
+
+// Called by logging functions to ensure that debug_file is initialized
+// and can be used for writing. Returns false if the file could not be
+// initialized. debug_file will be NULL in this case.
+bool InitializeLogFileHandle() {
+  if (log_file)
+    return true;
+
+  if (!log_file_name[0]) {
+    // nobody has called InitLogging to specify a debug log file, so here we
+    // initialize the log file name to the default
+    GetModuleFileName(NULL, log_file_name, MAX_PATH);
+    wchar_t* last_backslash = wcsrchr(log_file_name, '\\');
+    if (last_backslash)
+      last_backslash[1] = 0; // name now ends with the backslash
+    wcscat_s(log_file_name, L"debug.log");
+  }
+
+  log_file = CreateFile(log_file_name, GENERIC_WRITE,
+                        FILE_SHARE_READ | FILE_SHARE_WRITE, NULL,
+                        OPEN_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
+  if (log_file == INVALID_HANDLE_VALUE || log_file == NULL) {
+    // try the current directory
+    log_file = CreateFile(L".\\debug.log", GENERIC_WRITE,
+                          FILE_SHARE_READ | FILE_SHARE_WRITE, NULL,
+                          OPEN_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
+    if (log_file == INVALID_HANDLE_VALUE || log_file == NULL) {
+      log_file = NULL;
+      return false;
+    }
+  }
+  SetFilePointer(log_file, 0, 0, FILE_END);
+  return true;
+}
+
+void InitLogMutex() {
+  if (!log_mutex) {
+    // \ is not a legal character in mutex names so we replace \ with /
+    std::wstring safe_name(log_file_name);
+    std::replace(safe_name.begin(), safe_name.end(), '\\', '/');
+    std::wstring t(L"Global\\");
+    t.append(safe_name);
+    log_mutex = ::CreateMutex(NULL, FALSE, t.c_str());
+  }
+}
+
+void InitLogging(const wchar_t* new_log_file, LoggingDestination logging_dest,
+                 LogLockingState lock_log, OldFileDeletionState delete_old) {
+  g_enable_dcheck = CommandLine().HasSwitch(switches::kEnableDCHECK);
+
+  if (log_file) {
+    // calling InitLogging twice or after some log call has already opened the
+    // default log file will re-initialize to the new options
+    CloseHandle(log_file);
+    log_file = NULL;
+  }
+
+  lock_log_file = lock_log;
+  logging_destination = logging_dest;
+
+  // ignore file options if logging is disabled or only to system
+  if (logging_destination == LOG_NONE ||
+      logging_destination == LOG_ONLY_TO_SYSTEM_DEBUG_LOG)
+    return;
+
+  wcscpy_s(log_file_name, MAX_PATH, new_log_file);
+  if (delete_old == DELETE_OLD_LOG_FILE)
+    DeleteFile(log_file_name);
+
+  if (lock_log_file == LOCK_LOG_FILE) {
+    InitLogMutex();
+  } else if (!log_lock) {
+    log_lock = new LockImpl();
+  }
+
+  InitializeLogFileHandle();
+}
+
+void SetMinLogLevel(int level) {
+  min_log_level = level;
+}
+
+int GetMinLogLevel() {
+  return min_log_level;
+}
+
+void SetLogFilterPrefix(const char* filter)  {
+  if (log_filter_prefix) {
+    delete[] log_filter_prefix;
+    log_filter_prefix = NULL;
+  }
+
+  if (filter) {
+    size_t size = strlen(filter)+1;
+    log_filter_prefix = new char[size];
+    strcpy_s(log_filter_prefix, size, filter);
+  }
+}
+
+void SetLogItems(bool enable_process_id, bool enable_thread_id,
+                 bool enable_timestamp, bool enable_tickcount) {
+  log_process_id = enable_process_id;
+  log_thread_id = enable_thread_id;
+  log_timestamp = enable_timestamp;
+  log_tickcount = enable_tickcount;
+}
+
+void SetLogAssertHandler(LogAssertHandlerFunction handler) {
+  log_assert_handler = handler;
+}
+
+// Displays a message box to the user with the error message in it. For
+// Windows programs, it's possible that the message loop is messed up on
+// a fatal error, and creating a MessageBox will cause that message loop
+// to be run. Instead, we try to spawn another process that displays its
+// command line. We look for "Debug Message.exe" in the same directory as
+// the application. If it exists, we use it, otherwise, we use a regular
+// message box.
+void DisplayDebugMessage(const std::string& str) {
+  if (str.empty())
+    return;
+
+  // look for the debug dialog program next to our application
+  wchar_t prog_name[MAX_PATH];
+  GetModuleFileNameW(NULL, prog_name, MAX_PATH);
+  wchar_t* backslash = wcsrchr(prog_name, '\\');
+  if (backslash)
+    backslash[1] = 0;
+  wcscat_s(prog_name, MAX_PATH, L"debug_message.exe");
+
+  // stupid CreateProcess requires a non-const command line and may modify it.
+  // We also want to use the wide string
+  int charcount = MultiByteToWideChar(CP_UTF8, 0, str.c_str(), -1, NULL, 0);
+  if (!charcount)
+    return;
+  scoped_array<wchar_t> cmdline(new wchar_t[charcount]);
+  if (!MultiByteToWideChar(CP_UTF8, 0, str.c_str(), -1, cmdline.get(), charcount))
+    return;
+
+  STARTUPINFO startup_info;
+  memset(&startup_info, 0, sizeof(startup_info));
+  startup_info.cb = sizeof(startup_info);
+
+  PROCESS_INFORMATION process_info;
+  if (CreateProcessW(prog_name, cmdline.get(), NULL, NULL, false, 0, NULL,
+                     NULL, &startup_info, &process_info)) {
+    WaitForSingleObject(process_info.hProcess, INFINITE);
+    CloseHandle(process_info.hThread);
+    CloseHandle(process_info.hProcess);
+  } else {
+    // debug process broken, let's just do a message box
+    MessageBoxW(NULL, cmdline.get(), L"Fatal error",
+                MB_OK | MB_ICONHAND | MB_TOPMOST);
+  }
+}
+
+LogMessage::LogMessage(const char* file, int line, LogSeverity severity,
+                       int ctr)
+    : severity_(severity) {
+  Init(file, line);
+}
+
+LogMessage::LogMessage(const char* file, int line, const CheckOpString& result)
+    : severity_(LOG_FATAL) {
+  Init(file, line);
+  stream_ << "Check failed: " << (*result.str_);
+}
+
+LogMessage::LogMessage(const char* file, int line)
+     : severity_(LOG_INFO) {
+  Init(file, line);
+}
+
+LogMessage::LogMessage(const char* file, int line, LogSeverity severity)
+    : severity_(severity) {
+  Init(file, line);
+}
+
+// writes the common header info to the stream
+void LogMessage::Init(const char* file, int line) {
+  // log only the filename
+  const char* last_slash = strrchr(file, '\\');
+  if (last_slash)
+    file = last_slash + 1;
+
+  // TODO(darin): It might be nice if the columns were fixed width.
+
+  stream_ <<  '[';
+  if (log_process_id)
+    stream_ << GetCurrentProcessId() << ':';
+  if (log_thread_id)
+    stream_ << GetCurrentThreadId() << ':';
+  if (log_timestamp) {
+     time_t t = time(NULL);
+#if _MSC_VER >= 1400
+    struct tm local_time = {0};
+    localtime_s(&local_time, &t);
+    struct tm* tm_time = &local_time;
+#else
+    struct tm* tm_time = localtime(&t);
+#endif
+    stream_ << std::setfill('0')
+            << std::setw(2) << 1 + tm_time->tm_mon
+            << std::setw(2) << tm_time->tm_mday
+            << '/'
+            << std::setw(2) << tm_time->tm_hour
+            << std::setw(2) << tm_time->tm_min
+            << std::setw(2) << tm_time->tm_sec
+            << ':';
+  }
+  if (log_tickcount)
+    stream_ << GetTickCount() << ':';
+  stream_ << log_severity_names[severity_] << ":" << file << "(" << line << ")] ";
+
+  message_start_ = stream_.tellp();
+}
+
+LogMessage::~LogMessage() {
+  // TODO(brettw) modify the macros so that nothing is executed when the log
+  // level is too high.
+  if (severity_ < min_log_level)
+    return;
+
+  std::string str_newline(stream_.str());
+  str_newline.append("\r\n");
+
+  if (log_filter_prefix && severity_ <= kMaxFilteredLogLevel &&
+      str_newline.compare(message_start_, strlen(log_filter_prefix),
+                          log_filter_prefix) != 0) {
+    return;
+  }
+
+  if (logging_destination == LOG_ONLY_TO_SYSTEM_DEBUG_LOG ||
+      logging_destination == LOG_TO_BOTH_FILE_AND_SYSTEM_DEBUG_LOG)
+    OutputDebugStringA(str_newline.c_str());
+
+  // write to log file
+  if (logging_destination != LOG_NONE &&
+      logging_destination != LOG_ONLY_TO_SYSTEM_DEBUG_LOG &&
+      InitializeLogFileHandle()) {
+    // we can have multiple threads and/or processes, so try to prevent them from
+    // clobbering each other's writes
+    if (lock_log_file == LOCK_LOG_FILE) {
+      // Ensure that the mutex is initialized in case the client app did not
+      // call InitLogging. This is not thread safe. See below
+      InitLogMutex();
+
+      DWORD r = ::WaitForSingleObject(log_mutex, INFINITE);
+      DCHECK(r != WAIT_ABANDONED);
+    } else {
+      // use the lock
+      if (!log_lock) {
+        // The client app did not call InitLogging, and so the lock has not
+        // been created. We do this on demand, but if two threads try to do
+        // this at the same time, there will be a race condition to create
+        // the lock. This is why InitLogging should be called from the main
+        // thread at the beginning of execution.
+        log_lock = new LockImpl();
+      }
+      log_lock->Lock();
+    }
+
+    SetFilePointer(log_file, 0, 0, SEEK_END);
+    DWORD num_written;
+    WriteFile(log_file, (void*)str_newline.c_str(), (DWORD)str_newline.length(), &num_written, NULL);
+
+    if (lock_log_file == LOCK_LOG_FILE) {
+      ReleaseMutex(log_mutex);
+    } else {
+      log_lock->Unlock();
+    }
+  }
+
+  if (severity_ == LOG_FATAL) {
+    // display a message or break into the debugger on a fatal error
+    if (::IsDebuggerPresent()) {
+      __debugbreak();
+    } else {
+      if (log_assert_handler) {
+        // make a copy of the string for the handler out of paranoia
+        log_assert_handler(std::string(stream_.str()));
+      } else {
+        // don't use the string with the newline, get a fresh version to send to
+        // the debug message process
+        DisplayDebugMessage(stream_.str());
+        // Crash the process to generate a dump.
+        __debugbreak();
+      }
+    }
+  }
+}
+
+void CloseLogFile() {
+  if (!log_file)
+    return;
+
+  CloseHandle(log_file);
+  log_file = NULL;
+}
+
+} // namespace logging
+
+std::ostream& operator<<(std::ostream& out, const wchar_t* wstr) {
+  if (!wstr || !wstr[0])
+    return out;
+
+  // compute the length of the buffer we'll need
+  int charcount = WideCharToMultiByte(CP_UTF8, 0, wstr, -1,
+                                      NULL, 0, NULL, NULL);
+  if (charcount == 0)
+    return out;
+
+  // convert
+  scoped_array<char> buf(new char[charcount]);
+  WideCharToMultiByte(CP_UTF8, 0, wstr, -1, buf.get(), charcount, NULL, NULL);
+  return out << buf.get();
+}