Add API function Dart_ZoneAllocate

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/thread.h"
@@ skipping 344 matching lines @@
       previous_(previous), stack_marker_(stack_marker) { }
   ~ApiLocalScope() {
     previous_ = NULL;
   }
 
   // Accessors.
   ApiLocalScope* previous() const { return previous_; }
   uword stack_marker() const { return stack_marker_; }
   void set_previous(ApiLocalScope* value) { previous_ = value; }
   LocalHandles* local_handles() { return &local_handles_; }
-  ApiZone& zone() { return zone_; }
+  ApiZone* zone() { return &zone_; }
 
  private:
   ApiLocalScope* previous_;
   uword stack_marker_;
   LocalHandles local_handles_;
   ApiZone zone_;
 
   DISALLOW_COPY_AND_ASSIGN(ApiLocalScope);
 };
 
@@ skipping 86 matching lines @@
     }
     return total;
   }
   int CountPersistentHandles() const {
     return persistent_handles_.CountHandles();
   }
   int ZoneSizeInBytes() const {
     int total = 0;
     ApiLocalScope* scope = top_scope_;
     while (scope != NULL) {
-      total += scope->zone().SizeInBytes();
+      total += scope->zone()->SizeInBytes();
       scope = scope->previous();
     }
     return total;
   }
   PersistentHandle* Null() {
     if (null_ == NULL) {
       DARTSCOPE(Isolate::Current());
 
       Object& null_object = Object::Handle();
       null_ = persistent_handles().AllocateHandle();
@@ skipping 75 matching lines @@
           ApiNativeScope::Current()->zone()->GetBaseZone()) {}
   ApiGrowableArray()
       : BaseGrowableArray<T, ValueObject>(
           ApiNativeScope::Current()->zone()->GetBaseZone()) {}
 };
 
 
 }  // namespace dart
 
 #endif  // VM_DART_API_STATE_H_