Support Windows FILE_FLAG_SEQUENTIAL_SCAN in base::File.

base/files/file_win.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 "base/files/file.h"
 
 #include <io.h>
 
 #include "base/logging.h"
 #include "base/metrics/sparse_histogram.h"
@@ skipping 357 matching lines @@
   if (flags & FLAG_ASYNC)
     create_flags |= FILE_FLAG_OVERLAPPED;
   if (flags & FLAG_TEMPORARY)
     create_flags |= FILE_ATTRIBUTE_TEMPORARY;
   if (flags & FLAG_HIDDEN)
     create_flags |= FILE_ATTRIBUTE_HIDDEN;
   if (flags & FLAG_DELETE_ON_CLOSE)
     create_flags |= FILE_FLAG_DELETE_ON_CLOSE;
   if (flags & FLAG_BACKUP_SEMANTICS)
     create_flags |= FILE_FLAG_BACKUP_SEMANTICS;
+  if (flags & FLAG_SEQUENTIAL_SCAN)
+    create_flags |= FILE_FLAG_SEQUENTIAL_SCAN;
 
   file_.Set(CreateFile(path.value().c_str(), access, sharing, NULL,
                        disposition, create_flags, NULL));
 
   if (file_.IsValid()) {
     error_details_ = FILE_OK;
     async_ = ((flags & FLAG_ASYNC) == FLAG_ASYNC);
 
     if (flags & (FLAG_OPEN_ALWAYS))
       created_ = (ERROR_ALREADY_EXISTS != GetLastError());
     else if (flags & (FLAG_CREATE_ALWAYS | FLAG_CREATE))
       created_ = true;
   } else {
     error_details_ = OSErrorToFileError(GetLastError());
   }
 }
 
 bool File::DoFlush() {
   ThreadRestrictions::AssertIOAllowed();
   DCHECK(IsValid());
   return ::FlushFileBuffers(file_.Get()) != FALSE;
 }
 
 void File::SetPlatformFile(PlatformFile file) {
   file_.Set(file);
 }
 
 }  // namespace base