Add methods to base::SharedMemory to replace common SharedMemoryHandle operations.

base/memory/shared_memory_win.cc

 // Copyright (c) 2011 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/memory/shared_memory.h"
 
 #include <aclapi.h>
 
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
@@ skipping 82 matching lines @@
   ::CloseHandle(handle);
 }
 
 // static
 size_t SharedMemory::GetHandleLimit() {
   // Rounded down from value reported here:
   // http://blogs.technet.com/b/markrussinovich/archive/2009/09/29/3283844.aspx
   return static_cast<size_t>(1 << 23);
 }
 
+SharedMemoryHandle SharedMemory::ShallowCopyHandle(
+    const SharedMemoryHandle& handle) {
+  return handle;
+}
+
 bool SharedMemory::CreateAndMapAnonymous(size_t size) {
   return CreateAnonymous(size) && Map(size);
 }
 
 bool SharedMemory::Create(const SharedMemoryCreateOptions& options) {
   // TODO(bsy,sehr): crbug.com/210609 NaCl forces us to round up 64k here,
   // wasting 32k per mapping on average.
   static const size_t kSectionMask = 65536 - 1;
   DCHECK(!options.executable);
   DCHECK(!mapped_file_);
@@ skipping 162 matching lines @@
 void SharedMemory::UnlockDeprecated() {
   DCHECK(lock_ != NULL);
   ReleaseMutex(lock_);
 }
 
 SharedMemoryHandle SharedMemory::handle() const {
   return mapped_file_;
 }
 
 }  // namespace base