Fix a few issues breaking cctest/test-lockers/Regress1433:

src/v8threads.cc

 // Copyright 2008 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 28 matching lines @@
 
 // Track whether this V8 instance has ever called v8::Locker. This allows the
 // API code to verify that the lock is always held when V8 is being entered.
 bool Locker::active_ = false;
 
 
 // Constructor for the Locker object.  Once the Locker is constructed the
 // current thread will be guaranteed to have the lock for a given isolate.
 Locker::Locker(v8::Isolate* isolate)
   : has_lock_(false),
-    top_level_(false),
+    top_level_(true),
     isolate_(reinterpret_cast<i::Isolate*>(isolate)) {
   if (isolate_ == NULL) {
     isolate_ = i::Isolate::GetDefaultIsolateForLocking();
   }
   // Record that the Locker has been used at least once.
   active_ = true;
   // Get the big lock if necessary.
   if (!isolate_->thread_manager()->IsLockedByCurrentThread()) {
     isolate_->thread_manager()->Lock();
     has_lock_ = true;
@@ skipping 396 matching lines @@
 // Acknowledge the preemption by the receiving thread.
 void ContextSwitcher::PreemptionReceived() {
   ASSERT(Locker::IsLocked());
   // There is currently no accounting being done for this. But could be in the
   // future, which is why we leave this in.
 }
 
 
 }  // namespace internal
 }  // namespace v8