Add _android files for building DartVM on Android

runtime/bin/eventhandler_android.h

 // Copyright (c) 2012, 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.
 
-#ifndef BIN_EVENTHANDLER_LINUX_H_
-#define BIN_EVENTHANDLER_LINUX_H_
+#ifndef BIN_EVENTHANDLER_ANDROID_H_
+#define BIN_EVENTHANDLER_ANDROID_H_
 
 #if !defined(BIN_EVENTHANDLER_H_)
-#error Do not include eventhandler_linux.h directly; use eventhandler.h instead.
+#error Do not include eventhandler_android.h directly;
+#error use eventhandler.h instead.
 #endif
 
 #include <unistd.h>
 #include <sys/socket.h>
 
 #include "platform/hashmap.h"
 
 class InterruptMessage {
  public:
   intptr_t id;
@@ skipping 91 matching lines @@
 
   HashMap socket_map_;
   int64_t timeout_;  // Time for next timeout.
   Dart_Port timeout_port_;
   bool shutdown_;
   int interrupt_fds_[2];
   int epoll_fd_;
 };
 
 
-#endif  // BIN_EVENTHANDLER_LINUX_H_
+#endif  // BIN_EVENTHANDLER_ANDROID_H_