Lazily generate local var descriptors.

runtime/vm/service_test.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 "platform/globals.h"
 
 #include "include/dart_debugger_api.h"
 #include "vm/dart_api_impl.h"
 #include "vm/dart_entry.h"
 #include "vm/debugger.h"
@@ skipping 349 matching lines @@
   Dart_Handle result = Dart_Invoke(lib, NewString("main"), 0, NULL);
   EXPECT_VALID(result);
   const Class& class_a = Class::Handle(GetClass(vmlib, "A"));
   EXPECT(!class_a.IsNull());
   const Function& function_c = Function::Handle(GetFunction(class_a, "c"));
   EXPECT(!function_c.IsNull());
   const Code& code_c = Code::Handle(function_c.CurrentCode());
   EXPECT(!code_c.IsNull());
 
   const LocalVarDescriptors& descriptors =
-      LocalVarDescriptors::Handle(code_c.var_descriptors());
+      LocalVarDescriptors::Handle(code_c.GetLocalVarDescriptors());
   // Generate an ID for this object.
   ObjectIdRing* ring = isolate->object_id_ring();
   intptr_t id = ring->GetIdForObject(descriptors.raw());
 
   // Build a mock message handler and wrap it in a dart port.
   ServiceTestMessageHandler handler;
   Dart_Port port_id = PortMap::CreatePort(&handler);
   Dart_Handle port = Api::NewHandle(isolate, SendPort::New(port_id));
   EXPECT_VALID(port);
   EXPECT_VALID(Dart_SetField(lib, NewString("port"), port));
@@ skipping 207 matching lines @@
       Eval(lib, "[0, port, '0', 'getCpuProfile', ['tags'], ['Bogus']]");
   Service::HandleIsolateMessage(isolate, service_msg);
   handler.HandleNextMessage();
   // Expect error.
   EXPECT_SUBSTRING("\"type\":\"Error\"", handler.msg());
 }
 
 #endif  // !defined(TARGET_ARCH_ARM64)
 
 }  // namespace dart