Checkpoint work to get GN builds working on Android.

tools/gn/secondary/third_party/libevent/BUILD.gn

 # Copyright (c) 2013 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.
 
 static_library("libevent") {
   sources = [
     "buffer.c",
     "epoll.c",
     "epoll_sub.c",
     "evbuffer.c",
@@ skipping 17 matching lines @@
     libs = [ "rt" ]
   } else {
     sources -= [ "epoll.c", "epoll_sub.c" ]
   }
 
   if (is_mac) {
     include_dirs = [ "mac" ]
   } else if (is_linux) {
     include_dirs = [ "linux" ]
     sources -= [ "kqueue.c" ]
+  } else if (is_android) {
+    include_dirs = [ "android" ]
+    sources -= [ "kqueue.c" ]
   }
 
   configs -= [ "//build/config/compiler:chromium_code" ]
   configs += [ "//build/config/compiler:no_chromium_code" ]
 }