Stub out Socket::LookAddress on Fuchsia

runtime/bin/socket_fuchsia.cc

 // Copyright (c) 2016, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #if !defined(DART_IO_DISABLED)
 
 #include "platform/globals.h"
 #if defined(TARGET_OS_FUCHSIA)
 
 #include "bin/socket.h"
@@ skipping 97 matching lines @@
 
 intptr_t Socket::GetStdioHandle(intptr_t num) {
   UNIMPLEMENTED();
   return num;
 }
 
 
 AddressList<SocketAddress>* Socket::LookupAddress(const char* host,
                                                   int type,
                                                   OSError** os_error) {
-  UNIMPLEMENTED();
+  // UNIMPLEMENTED
+  ASSERT(*os_error == NULL);
+  *os_error = new OSError(-1,
+                          "Socket::LookupAddress not implemented in "
+                          "Fuchsia Dart VM runtime",
+                          OSError::kGetAddressInfo);
   return NULL;
 }
 
 
 bool Socket::ReverseLookup(const RawAddr& addr,
                            char* host,
                            intptr_t host_len,
                            OSError** os_error) {
   UNIMPLEMENTED();
   return false;
@@ skipping 110 matching lines @@
   UNIMPLEMENTED();
   return false;
 }
 
 }  // namespace bin
 }  // namespace dart
 
 #endif  // defined(TARGET_OS_FUCHSIA)
 
 #endif  // !defined(DART_IO_DISABLED)