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

base/memory/shared_memory_nacl.cc

Index: base/memory/shared_memory_nacl.cc
diff --git a/base/memory/shared_memory_nacl.cc b/base/memory/shared_memory_nacl.cc
index bc2a98dfdf65551e5ab3abd507aabaefd8f72502..b8cb8ab2fa7fff2005e2288206dd8c09c5392d5b 100644
--- a/base/memory/shared_memory_nacl.cc
+++ b/base/memory/shared_memory_nacl.cc
@@ -66,6 +66,15 @@ void SharedMemory::CloseHandle(const SharedMemoryHandle& handle) {
     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;