Allow calling stats API functions before we have an isolate.

src/api.cc

 // Copyright 2010 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 4380 matching lines @@
       int frame_limit,
       StackTrace::StackTraceOptions options) {
   i::Isolate::Current()->SetCaptureStackTraceForUncaughtExceptions(
       capture,
       frame_limit,
       options);
 }
 
 
 void V8::SetCounterFunction(CounterLookupCallback callback) {
-  i::Isolate* isolate = i::Isolate::Current();
+  i::Isolate* isolate = EnterIsolateIfNeeded();
   if (IsDeadCheck(isolate, "v8::V8::SetCounterFunction()")) return;
   isolate->stats_table()->SetCounterFunction(callback);
 }
 
 void V8::SetCreateHistogramFunction(CreateHistogramCallback callback) {
-  i::Isolate* isolate = i::Isolate::Current();
+  i::Isolate* isolate = EnterIsolateIfNeeded();
   if (IsDeadCheck(isolate, "v8::V8::SetCreateHistogramFunction()")) return;
   isolate->stats_table()->SetCreateHistogramFunction(callback);
 }
 
 void V8::SetAddHistogramSampleFunction(AddHistogramSampleCallback callback) {
-  i::Isolate* isolate = i::Isolate::Current();
+  i::Isolate* isolate = EnterIsolateIfNeeded();
   if (IsDeadCheck(isolate, "v8::V8::SetAddHistogramSampleFunction()")) return;
   isolate->stats_table()->
       SetAddHistogramSampleFunction(callback);
 }
 
 void V8::EnableSlidingStateWindow() {
   i::Isolate* isolate = i::Isolate::Current();
   if (IsDeadCheck(isolate, "v8::V8::EnableSlidingStateWindow()")) return;
   isolate->logger()->EnableSlidingStateWindow();
 }
@@ skipping 1298 matching lines @@
 
 
 char* HandleScopeImplementer::Iterate(ObjectVisitor* v, char* storage) {
   HandleScopeImplementer* thread_local =
       reinterpret_cast<HandleScopeImplementer*>(storage);
   thread_local->IterateThis(v);
   return storage + ArchiveSpacePerThread();
 }
 
 } }  // namespace v8::internal