Return error object from Dart_Allocate when an error occurs.

runtime/vm/reusable_handles.h

 // Copyright (c) 2013, 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 VM_REUSABLE_HANDLES_H_
 #define VM_REUSABLE_HANDLES_H_
 
 #include "vm/allocation.h"
 #include "vm/handles.h"
 #include "vm/object.h"
@@ skipping 60 matching lines @@
     private:                                                                   \
     name* handle_;                                                             \
     DISALLOW_COPY_AND_ASSIGN(Reusable##name##HandleScope);                     \
   };
 #endif  // defined(DEBUG)
 REUSABLE_HANDLE_LIST(REUSABLE_SCOPE)
 #undef REUSABLE_SCOPE
 
 #define REUSABLE_OBJECT_HANDLESCOPE(isolate)                                   \
   ReusableObjectHandleScope reused_object_handle(isolate);
+#define REUSABLE_ERROR_HANDLESCOPE(isolate)                                    \
+  ReusableErrorHandleScope reused_error_handle(isolate);
 #define REUSABLE_ARRAY_HANDLESCOPE(isolate)                                    \
   ReusableArrayHandleScope reused_array_handle(isolate);
 #define REUSABLE_STRING_HANDLESCOPE(isolate)                                   \
   ReusableStringHandleScope reused_string_handle(isolate);
 #define REUSABLE_INSTANCE_HANDLESCOPE(isolate)                                 \
   ReusableInstanceHandleScope reused_instance_handle(isolate);
 #define REUSABLE_FUNCTION_HANDLESCOPE(isolate)                                 \
   ReusableFunctionHandleScope reused_function_handle(isolate);
 #define REUSABLE_FIELD_HANDLESCOPE(isolate)                                    \
   ReusableFieldHandleScope reused_field_handle(isolate);
 #define REUSABLE_CLASS_HANDLESCOPE(isolate)                                    \
   ReusableClassHandleScope reused_class_handle(isolate);
 #define REUSABLE_TYPE_PARAMETER_HANDLESCOPE(isolate)                           \
   ReusableTypeParameterHandleScope reused_type_parameter(isolate);
 #define REUSABLE_TYPE_ARGUMENTS_HANDLESCOPE(isolate)                           \
   ReusableTypeArgumentsHandleScope reused_type_arguments_handle(isolate);
 
 }  // namespace dart
 
 #endif  // VM_REUSABLE_HANDLES_H_