base: Print sub-second resolution timestamps

base/logging.cc

Index: base/logging.cc
diff --git a/base/logging.cc b/base/logging.cc
index 0771b47c182e5c18c868f1124a0784bf411d74a9..e0ca19933e75d546cb18c755c0f8024b23de776d 100644
--- a/base/logging.cc
+++ b/base/logging.cc
@@ -765,13 +765,12 @@ void LogMessage::Init(const char* file, int line) {
   if (g_log_thread_id)
     stream_ << base::PlatformThread::CurrentId() << ':';
   if (g_log_timestamp) {
-    time_t t = time(nullptr);
-    struct tm local_time = {0};
-#ifdef _MSC_VER
-    localtime_s(&local_time, &t);
-#else
+#if defined(OS_POSIX)
+    timeval tv;
+    gettimeofday(&tv, nullptr);
+    time_t t = tv.tv_sec;
+    struct tm local_time;
     localtime_r(&t, &local_time);
-#endif
     struct tm* tm_time = &local_time;
     stream_ << std::setfill('0')
             << std::setw(2) << 1 + tm_time->tm_mon
@@ -780,7 +779,23 @@ void LogMessage::Init(const char* file, int line) {
             << std::setw(2) << tm_time->tm_hour
             << std::setw(2) << tm_time->tm_min
             << std::setw(2) << tm_time->tm_sec
+            << '.'
+            << std::setw(6) << tv.tv_usec
             << ':';
+#elif defined(OS_WIN)
+    SYSTEMTIME local_time;
+    GetLocalTime(&local_time);
+    stream_ << std::setfill('0')
+            << std::setw(2) << local_time.wMonth
+            << std::setw(2) << local_time.wDay
+            << '/'
+            << std::setw(2) << local_time.wHour
+            << std::setw(2) << local_time.wMinute
+            << std::setw(2) << local_time.wSecond
+            << '.'
+            << std::setw(3) << local_time.wMilliseconds
+            << ':';
+#endif
   }
   if (g_log_tickcount)
     stream_ << TickCount() << ':';