observatory/vm: add support for computing/passing end tokens on classes

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 822 matching lines @@
     "\"option_keys\":[],\"option_values\":[]}}", handler.msg());
 
   // Request the class A over the service.
   service_msg = EvalF(h_lib, "[0, port, ['classes', '%" Pd "'], [], []]", cid);
   Service::HandleIsolateMessage(isolate, service_msg);
   handler.HandleNextMessage();
   EXPECT_SUBSTRING("\"type\":\"Class\"", handler.msg());
   ExpectSubstringF(handler.msg(),
                    "\"id\":\"classes\\/%" Pd "\",\"name\":\"A\",", cid);
   ExpectSubstringF(handler.msg(), "\"allocationStats\":");
+  ExpectSubstringF(handler.msg(), "\"tokenPos\":");
+  ExpectSubstringF(handler.msg(), "\"endTokenPos\":");
 
   // Evaluate an expression from class A.
   service_msg = EvalF(h_lib,
                       "[0, port, ['classes', '%" Pd "', 'eval'], "
                       "['expr'], ['cobra + 100000']]", cid);
   Service::HandleIsolateMessage(isolate, service_msg);
   handler.HandleNextMessage();
   handler.filterMsg("name");
   EXPECT_STREQ(
       "{\"type\":\"@Smi\","
@@ skipping 946 matching lines @@
   service_msg = Eval(h_lib, "[0, port, ['profile'], ['tags'], ['hidden']]");
   Service::HandleIsolateMessage(isolate, service_msg);
   handler.HandleNextMessage();
   // Expect error.
   EXPECT_SUBSTRING("\"type\":\"Error\"", handler.msg());
 }
 
 #endif  // !defined(TARGET_ARCH_ARM64)
 
 }  // namespace dart