Properly honor base::SharedMemory semantics for name="" to mean...

base/file_util_win.cc

Index: base/file_util_win.cc
===================================================================
--- base/file_util_win.cc	(revision 8817)
+++ base/file_util_win.cc	(working copy)
@@ -395,6 +395,10 @@
   return true;
 }
 
+bool GetShmemTempDir(FilePath* path) {
+  return GetTempDir(path);
+}
+
 bool CreateTemporaryFileName(FilePath* path) {
   std::wstring temp_path, temp_file;
 
@@ -409,6 +413,22 @@
   return false;
 }
 
+// On POSIX we have semantics to create and open a temporary file
+// atomically.
+// TODO(jrg): is there equivalent call to use on Windows instead of
+// going 2-step?
+FILE* CreateAndOpenTemporaryFile(FilePath* path) {
+
+  if (!CreateTemporaryFileName(path)) {
+    return NULL;
+  }
+  return OpenFile(*path, "w+");
+}
+
+FILE* CreateAndOpenTemporaryShmemFile(FilePath* path) {
+  return CreateAndOpenTemporaryFile(path);
+}
+
 bool CreateTemporaryFileNameInDir(const std::wstring& dir,
                                   std::wstring* temp_file) {
   wchar_t temp_name[MAX_PATH + 1];