[Aura] Added Support for rendering software compositor frames as cc::TextureLayers.

base/memory/shared_memory_nacl.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/memory/shared_memory.h"
 
 #include <errno.h>
 #include <fcntl.h>
 #include <sys/mman.h>
 #include <sys/stat.h>
@@ skipping 48 matching lines @@
   return SharedMemoryHandle();
 }
 
 // static
 void SharedMemory::CloseHandle(const SharedMemoryHandle& handle) {
   DCHECK_GE(handle.fd, 0);
   if (close(handle.fd) < 0)
     DPLOG(ERROR) << "close";
 }
 
+//static
+SharedMemoryHandle SharedMemory::DuplicateHandle(
+    const SharedMemoryHandle& handle) {
+  SharedMemoryHandle result;
+  result.fd = dup(handle.fd);
+  result.auto_close = false;
+  return result;
+}
+
 bool SharedMemory::CreateAndMapAnonymous(size_t size) {
   // Untrusted code can't create descriptors or handles.
   return false;
 }
 
 bool SharedMemory::Create(const SharedMemoryCreateOptions& options) {
   // Untrusted code can't create descriptors or handles.
   return false;
 }
 
@@ skipping 70 matching lines @@
 
   new_handle->fd = new_fd;
   new_handle->auto_close = true;
 
   if (close_self)
     Close();
   return true;
 }
 
 }  // namespace base