Make --trace-natives respect the isolate filter.

runtime/vm/native_entry.h

 // Copyright (c) 2011, 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.
 
 #ifndef RUNTIME_VM_NATIVE_ENTRY_H_
 #define RUNTIME_VM_NATIVE_ENTRY_H_
 
 #include "platform/memory_sanitizer.h"
 
 #include "vm/allocation.h"
 #include "vm/assembler.h"
 #include "vm/code_generator.h"
 #include "vm/exceptions.h"
+#include "vm/log.h"
 #include "vm/native_arguments.h"
 #include "vm/verifier.h"
 
 #include "include/dart_api.h"
 
 namespace dart {
 
 // Forward declarations.
 class Class;
 class String;
 
 // We have three variants of native functions:
 //  - bootstrap natives, which are called directly from stub code. The callee is
 //    responsible for safepoint transitions and setting up handle scopes as
 //    needed. Only VM-defined natives are bootstrap natives; they cannot be
 //    defined by embedders or native extensions.
 //  - no scope natives, which are called through a wrapper function. The wrapper
 //    function handles the safepoint transition. The callee is responsible for
 //    setting up API scopes as needed.
 //  - auto scope natives, which are called through a wrapper function. The
 //    wrapper function handles the safepoint transition and sets up an API
 //    scope.
 
 typedef void (*NativeFunction)(NativeArguments* arguments);
 
+#ifndef PRODUCT
+#define TRACE_NATIVE_CALL(format, name)                                        \
+  if (FLAG_trace_natives) {                                                    \
+    THR_Print("Calling native: " format "\n", name);                           \
+  }
+#else
+#define TRACE_NATIVE_CALL(format, name)                                        \
+  do {                                                                         \
+  } while (0)
+#endif
 
 #define NATIVE_ENTRY_FUNCTION(name) BootstrapNatives::DN_##name
 
 #ifdef DEBUG
 #define SET_NATIVE_RETVAL(args, value)                                         \
   RawObject* retval = value;                                                   \
   ASSERT(retval->IsDartInstance());                                            \
   arguments->SetReturnUnsafe(retval);
 #else
 #define SET_NATIVE_RETVAL(arguments, value) arguments->SetReturnUnsafe(value);
@@ skipping 90 matching lines @@
   static void AutoScopeNativeCallWrapperNoStackCheck(Dart_NativeArguments args,
                                                      Dart_NativeFunction func);
 
   static bool ReturnValueIsError(NativeArguments* arguments);
   static void PropagateErrors(NativeArguments* arguments);
 };
 
 }  // namespace dart
 
 #endif  // RUNTIME_VM_NATIVE_ENTRY_H_