Implement SharedMemory::NewAnonymousReadOnly(contents).

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 "base/logging.h"
 #include "base/strings/utf_string_conversions.h"
 
 namespace {
@@ skipping 170 matching lines @@
   if (memory_ == NULL)
     return false;
 
   UnmapViewOfFile(memory_);
   memory_ = NULL;
   return true;
 }
 
 bool SharedMemory::ShareToProcessCommon(ProcessHandle process,
                                         SharedMemoryHandle *new_handle,
-                                        bool close_self) {
+                                        bool close_self,
+                                        ShareMode share_mode) {
   *new_handle = 0;
   DWORD access = STANDARD_RIGHTS_REQUIRED | FILE_MAP_READ;
   DWORD options = 0;
   HANDLE mapped_file = mapped_file_;
   HANDLE result;
-  if (!read_only_)
+  if (share_mode == SHARE_CURRENT_MODE && !read_only_)
     access |= FILE_MAP_WRITE;
   if (close_self) {
     // DUPLICATE_CLOSE_SOURCE causes DuplicateHandle to close mapped_file.
     options = DUPLICATE_CLOSE_SOURCE;
     mapped_file_ = NULL;
     Unmap();
   }
 
   if (process == GetCurrentProcess() && close_self) {
     *new_handle = mapped_file;
@@ skipping 43 matching lines @@
 void SharedMemory::Unlock() {
   DCHECK(lock_ != NULL);
   ReleaseMutex(lock_);
 }
 
 SharedMemoryHandle SharedMemory::handle() const {
   return mapped_file_;
 }
 
 }  // namespace base