Verify proper API use of acquire/release typed data

runtime/vm/dart_api_state.h

 // 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.
 
 #ifndef VM_DART_API_STATE_H_
 #define VM_DART_API_STATE_H_
 
 #include "include/dart_api.h"
 
 #include "platform/utils.h"
 #include "vm/bitfield.h"
 #include "vm/dart_api_impl.h"
 #include "vm/flags.h"
 #include "vm/growable_array.h"
 #include "vm/handles.h"
 #include "vm/object.h"
 #include "vm/os.h"
 #include "vm/raw_object.h"
 #include "vm/os_thread.h"
 #include "vm/visitor.h"
+#include "vm/weak_table.h"
 
 #include "vm/handles_impl.h"
 
 namespace dart {
 
 DECLARE_DEBUG_FLAG(bool, trace_zones);
 DECLARE_DEBUG_FLAG(bool, trace_handles);
 
 // Implementation of Zone support for very fast allocation of small chunks
 // of memory. The chunks cannot be deallocated individually, but instead
@@ skipping 794 matching lines @@
 
   PersistentHandle* AcquiredError() const {
     ASSERT(acquired_error_ != NULL);
     return acquired_error_;
   }
 
   WeakReferenceSetBuilder* NewWeakReferenceSetBuilder();
 
   void DelayWeakReferenceSet(WeakReferenceSet* reference_set);
 
+  WeakTable* acquired_table() { return &acquired_table_; }
+
  private:
   PersistentHandles persistent_handles_;
   FinalizablePersistentHandles weak_persistent_handles_;
   FinalizablePersistentHandles prologue_weak_persistent_handles_;
   ApiLocalScope* reusable_scope_;
   ApiLocalScope* top_scope_;
   WeakReferenceSet* delayed_weak_reference_sets_;
+  WeakTable acquired_table_;
 
   // Persistent handles to important objects.
   PersistentHandle* null_;
   PersistentHandle* true_;
   PersistentHandle* false_;
   PersistentHandle* acquired_error_;
 
   DISALLOW_COPY_AND_ASSIGN(ApiState);
 };
 
@@ skipping 119 matching lines @@
   ref->set_peer(peer);
   ref->set_callback(callback);
   // This may trigger GC, so it must be called last.
   ref->SetExternalSize(external_size, isolate);
   return ref;
 }
 
 }  // namespace dart
 
 #endif  // VM_DART_API_STATE_H_