Fix DevFS on Android devices

runtime/bin/directory_android.cc

 // 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.
 
 #include "platform/globals.h"
 #if defined(TARGET_OS_ANDROID)
 
 #include "bin/directory.h"
 
 #include <dirent.h>  // NOLINT
@@ skipping 385 matching lines @@
   int result = NO_RETRY_EXPECTED(mkdir(dir_name, 0777));
   // If the directory already exists, treat it as a success.
   if ((result == -1) && (errno == EEXIST)) {
     return (Exists(dir_name) == EXISTS);
   }
   return (result == 0);
 }
 
 
 const char* Directory::SystemTemp() {
+  if (Directory::system_temp_path_override_ != NULL) {
+    return DartUtils::ScopedCopyCString(Directory::system_temp_path_override_);
+  }
   // Android does not have a /tmp directory. A partial substitute,
   // suitable for bring-up work and tests, is to create a tmp
   // directory in /data/local/tmp.
   //
   // TODO(4413): In the long run, when running in an application we should

[rmacnak, 2016/07/18 17:41:49]

I'd reference this issue in the commit message.

[Cutch, 2016/07/18 17:44:58]

Done.

   // probably use the appropriate directory from the Android API,
   // probably what File.createTempFile uses.
 #define ANDROID_TEMP_DIR "/data/local/tmp"
   struct stat st;
   if (stat(ANDROID_TEMP_DIR, &st) != 0) {
     mkdir(ANDROID_TEMP_DIR, 0777);
   }
   return ANDROID_TEMP_DIR;
 }
 
@@ skipping 44 matching lines @@
   if (exists != EXISTS) {
     return false;
   }
   return (NO_RETRY_EXPECTED(rename(path, new_path)) == 0);
 }
 
 }  // namespace bin
 }  // namespace dart
 
 #endif  // defined(TARGET_OS_ANDROID)