Uses a finalizer to delete zlib filter resources

runtime/bin/filter.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 BIN_FILTER_H_
 #define BIN_FILTER_H_
 
 #include "bin/builtin.h"
 #include "bin/utils.h"
 
@@ skipping 11 matching lines @@
 
   /**
    * On a successful call to Process, Process will take ownership of data. On
    * successive calls to either Processed or ~Filter, data will be freed with
    * a delete[] call.
    */
   virtual bool Process(uint8_t* data, intptr_t length) = 0;
   virtual intptr_t Processed(uint8_t* buffer, intptr_t length, bool finish,
                              bool end) = 0;
 
-  static Dart_Handle SetFilterPointerNativeField(Dart_Handle filter,
-                                                 Filter* filter_pointer);
-  static Dart_Handle GetFilterPointerNativeField(Dart_Handle filter,
-                                                 Filter** filter_pointer);
+  static Dart_Handle SetFilterAndCreateFinalizer(Dart_Handle filter,
+                                                 Filter* filter_pointer,
+                                                 intptr_t filter_size);
+  static Dart_Handle GetFilterNativeField(Dart_Handle filter,
+                                          Filter** filter_pointer);
 
   bool initialized() const { return initialized_; }
   void set_initialized(bool value) { initialized_ = value; }
   uint8_t* processed_buffer() { return processed_buffer_; }
   intptr_t processed_buffer_size() const { return kFilterBufferSize; }
 
  protected:
   Filter() : initialized_(false) {}
 
  private:
@@ skipping 57 matching lines @@
   uint8_t* current_buffer_;
   z_stream stream_;
 
   DISALLOW_COPY_AND_ASSIGN(ZLibInflateFilter);
 };
 
 }  // namespace bin
 }  // namespace dart
 
 #endif  // BIN_FILTER_H_