Add non-blocking peek for the syncsocket...

base/sync_socket_posix.cc

 // Copyright (c) 2009 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/sync_socket.h"
 
 #include <errno.h>
 #include <limits.h>
 #include <stdio.h>
 #include <sys/types.h>
@@ skipping 80 matching lines @@
 size_t SyncSocket::Receive(void* buffer, size_t length) {
   DCHECK(length <= kMaxMessageLength);
   char* charbuffer = static_cast<char*>(buffer);
   if (file_util::ReadFromFD(handle_, charbuffer, length)) {
     return length;
   } else {
     return -1;
   }
 }
 
+// TODO(port). Some kind of select?
+size_t SyncSocket::Peek() {
+  NOTIMPLEMENTED();
+  return 0;
+}
+
 }  // namespace base