Fix DevFS on Android devices

runtime/bin/directory.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.
 
 #if !defined(DART_IO_DISABLED)
 
 #include "bin/directory.h"
 
 #include "bin/dartutils.h"
 #include "bin/log.h"
 #include "include/dart_api.h"
 #include "platform/assert.h"
 
 namespace dart {
 namespace bin {
 
+char* Directory::system_temp_path_override_ = NULL;
+
 void FUNCTION_NAME(Directory_Current)(Dart_NativeArguments args) {
   const char* current = Directory::Current();
   if (current != NULL) {
     Dart_SetReturnValue(args, DartUtils::NewString(current));
   } else {
     Dart_SetReturnValue(args, DartUtils::NewDartOSError());
   }
 }
 
 
@@ skipping 153 matching lines @@
       dart_this,
       kAsyncDirectoryListerFieldIndex,
       listing_pointer);
   if (Dart_IsError(result)) {
     Log::PrintErr("SetAsyncDirectoryListerPointer failed\n");
     Dart_PropagateError(result);
   }
 }
 
 
+void Directory::SetSystemTemp(const char* path) {
+  if (system_temp_path_override_ != NULL) {
+    free(system_temp_path_override_);
+    system_temp_path_override_ = NULL;
+  }
+  if (path != NULL) {
+    system_temp_path_override_ = strdup(path);
+  }
+}
+
+
 CObject* Directory::CreateRequest(const CObjectArray& request) {
   if ((request.Length() == 1) && request[0]->IsString()) {
     CObjectString path(request[0]);
     if (Directory::Create(path.CString())) {
       return CObject::True();
     } else {
       return CObject::NewOSError();
     }
   }
   return CObject::IllegalArgumentError();
@@ skipping 285 matching lines @@
     listing->HandleDone();
   } else {
     while (ListNext(listing)) {}
   }
 }
 
 }  // namespace bin
 }  // namespace dart
 
 #endif  // !defined(DART_IO_DISABLED)