include what you use: errno.h in tools/android/

tools/android/forwarder2/pipe_notifier.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 "tools/android/forwarder2/pipe_notifier.h"
 
+#include <errno.h>
 #include <fcntl.h>
 #include <unistd.h>
 #include <sys/socket.h>
 #include <sys/types.h>
 
 #include "base/logging.h"
 #include "base/posix/eintr_wrapper.h"
 
 namespace forwarder2 {
 
@@ skipping 27 matching lines @@
   int ret = HANDLE_EINTR(read(receiver_fd_, &c, 1));
   if (ret < 0) {
     PLOG(ERROR) << "read";
     return;
   }
   DCHECK_EQ(1, ret);
   DCHECK_EQ('1', c);
 }
 
 }  // namespace forwarder