Keep zone cached in SnapshotReader to allow removing ZoneHandle(Isolate*) interface.

runtime/vm/dart.cc

 // 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.
 
 #include "vm/dart.h"
 
 #include "vm/code_observers.h"
 #include "vm/cpu.h"
 #include "vm/dart_api_state.h"
 #include "vm/dart_entry.h"
@@ skipping 220 matching lines @@
     if (snapshot == NULL) {
       const String& message = String::Handle(
           String::New("Invalid snapshot."));
       return ApiError::New(message);
     }
     ASSERT(snapshot->kind() == Snapshot::kFull);
     if (FLAG_trace_isolates) {
       OS::Print("Size of isolate snapshot = %" Pd "\n", snapshot->length());
     }
     SnapshotReader reader(snapshot->content(), snapshot->length(),
-                          Snapshot::kFull, isolate);
+                          Snapshot::kFull, isolate, zone.GetZone());
     const Error& error = Error::Handle(reader.ReadFullSnapshot());
     if (!error.IsNull()) {
       return error.raw();
     }
     if (FLAG_trace_isolates) {
       isolate->heap()->PrintSizes();
       isolate->megamorphic_cache_table()->PrintSizes();
     }
   }
 
@@ skipping 58 matching lines @@
   return predefined_handles_->handles_.AllocateScopedHandle();
 }
 
 
 bool Dart::IsReadOnlyHandle(uword address) {
   ASSERT(predefined_handles_ != NULL);
   return predefined_handles_->handles_.IsValidScopedHandle(address);
 }
 
 }  // namespace dart