Revised CL for customisable logging (replacing printfs).

runtime/bin/platform_win.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "bin/platform.h"
+#include "bin/log.h"
 #include "bin/socket.h"
 
 bool Platform::Initialize() {
   // Nothing to do on Windows.
   return true;
 }
 
 
 int Platform::NumberOfProcessors() {
   SYSTEM_INFO info;
@@ skipping 50 matching lines @@
   DWORD message_size =
       FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS,
                     NULL,
                     error_code,
                     MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
                     error,
                     kBufferSize,
                     NULL);
   if (message_size == 0) {
     if (GetLastError() != ERROR_INSUFFICIENT_BUFFER) {
-      fprintf(stderr, "FormatMessage failed %d\n", GetLastError());
+      Log::PrintErr("FormatMessage failed %d\n", GetLastError());
     }
     snprintf(error, kBufferSize, "OS Error %d", error_code);
   }
   // Strip out \r\n at the end of the generated message and ensure
   // null termination.
   if (message_size > 2 &&
       error[message_size - 2] == '\r' &&
       error[message_size - 1] == '\n') {
     error[message_size - 2] = '\0';
   } else {
     error[kBufferSize - 1] = '\0';
   }
   return error;
 }