Auto create ApiLocalScope before calling native functions, this ensures that

runtime/vm/stack_frame_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 "include/dart_api.h"
 #include "platform/assert.h"
 #include "vm/class_finalizer.h"
 #include "vm/compiler.h"
 #include "vm/dart_api_impl.h"
 #include "vm/dart_entry.h"
@@ skipping 57 matching lines @@
   while (frames.NextFrame() != NULL) {
     count += 1;  // Count the dart frame.
   }
   VerifyPointersVisitor::VerifyPointers();
   NativeArguments* arguments = reinterpret_cast<NativeArguments*>(args);
   arguments->SetReturn(Object::Handle(Smi::New(count)));
 }
 
 
 void FUNCTION_NAME(StackFrame_validateFrame)(Dart_NativeArguments args) {
-  Dart_EnterScope();
   Dart_Handle index = Dart_GetNativeArgument(args, 0);
   Dart_Handle name = Dart_GetNativeArgument(args, 1);
   const Smi& frame_index_smi = Smi::CheckedHandle(Api::UnwrapHandle(index));
   const char* expected_name =
       String::CheckedHandle(Api::UnwrapHandle(name)).ToCString();
   int frame_index = frame_index_smi.Value();
   int count = 0;
   DartFrameIterator frames;
   StackFrame* frame = frames.NextFrame();
   while (frame != NULL) {
@@ skipping 12 matching lines @@
       const Library& lib = Library::Handle(Library::LookupLibrary(url));
       ASSERT(!lib.IsNull());
       const char* lib_name = String::Handle(lib.url()).ToCString();
       intptr_t length = OS::SNPrint(NULL, 0, "%s_%s", lib_name, expected_name);
       char* full_name = isolate->current_zone()->Alloc<char>(length + 1);
       ASSERT(full_name != NULL);
       OS::SNPrint(full_name, (length + 1), "%s_%s", lib_name, expected_name);
       if (strcmp(full_name, name) != 0) {
         FATAL("StackFrame_validateFrame fails, incorrect frame.\n");
       }
-      Dart_ExitScope();
       return;
     }
     count += 1;  // Count the dart frames.
     frame = frames.NextFrame();
   }
   FATAL("StackFrame_validateFrame fails, frame count < index passed in.\n");
 }
 
 
 // List all native functions implemented in the vm or core boot strap dart
@@ skipping 158 matching lines @@
       "  }"
       "}";
   Dart_Handle lib = TestCase::LoadTestScript(
       kScriptChars,
       reinterpret_cast<Dart_NativeEntryResolver>(native_lookup));
   Dart_Handle cls = Dart_GetClass(lib, NewString("StackFrame2Test"));
   EXPECT_VALID(Dart_Invoke(cls, NewString("testMain"), 0, NULL));
 }
 
 }  // namespace dart