getObject now supports specifying offset,count for strings.

runtime/vm/object_test.cc

 // 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.
 
 #include "platform/globals.h"
 
 #include "vm/assembler.h"
 #include "vm/class_finalizer.h"
 #include "vm/dart_api_impl.h"
 #include "vm/dart_entry.h"
@@ skipping 4248 matching lines @@
     str.PrintJSON(&js, true);
     ElideJSONSubstring("classes", js.ToCString(), buffer);
     ElideJSONSubstring("objects", buffer, buffer);
     ElideJSONSubstring("_OneByteString@", buffer, buffer);
     EXPECT_STREQ(
         "{\"type\":\"@Instance\","
         "\"_vmType\":\"String\","
         "\"class\":{\"type\":\"@Class\",\"fixedId\":true,\"id\":\"\","
         "\"name\":\"_OneByteString\",\"_vmName\":\"\"},"
         "\"kind\":\"String\","
-        "\"id\":\"\",\"valueAsString\":\"dw\"}",
+        "\"id\":\"\",\"length\":2,\"valueAsString\":\"dw\"}",
         buffer);
   }
   // Array reference
   {
     JSONStream js;
     const Array& array = Array::Handle(Array::New(0));
     array.PrintJSON(&js, true);
     ElideJSONSubstring("classes", js.ToCString(), buffer);
     ElideJSONSubstring("objects", buffer, buffer);
     ElideJSONSubstring("_List@", buffer, buffer);
@@ skipping 398 matching lines @@
   String& test = String::Handle();
   String& result = String::Handle();
   for (size_t i = 0; i < ARRAY_SIZE(tests); i++) {
     test = String::New(tests[i].in);
     result = String::IdentifierPrettyName(test);
     EXPECT_STREQ(tests[i].out, result.ToCString());
   }
 }
 
 }  // namespace dart