Serializer enable/disable flags need thread safety.

src/v8.cc

 // Copyright 2012 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 80 matching lines @@
   ElementsAccessor::TearDown();
   LOperand::TearDownCaches();
   ExternalReference::TearDownMathExpData();
   RegisteredExtension::UnregisterAll();
   Isolate::GlobalTearDown();
 
   delete call_completed_callbacks_;
   call_completed_callbacks_ = NULL;
 
   Sampler::TearDown();
+  Serializer::TearDown();
 
 #ifdef V8_USE_DEFAULT_PLATFORM
   DefaultPlatform* platform = static_cast<DefaultPlatform*>(platform_);
   platform_ = NULL;
   delete platform;
 #endif
 }
 
 
 void V8::SetReturnAddressLocationResolver(
@@ skipping 54 matching lines @@
 
   // Increase call depth to prevent recursive callbacks.
   handle_scope_implementer->IncrementCallDepth();
   Execution::RunMicrotasks(isolate);
   handle_scope_implementer->DecrementCallDepth();
 }
 
 
 void V8::InitializeOncePerProcessImpl() {
   FlagList::EnforceFlagImplications();
+  Serializer::InitializeOncePerProcess();
 
   if (FLAG_predictable && FLAG_random_seed == 0) {
     // Avoid random seeds in predictable mode.
     FLAG_random_seed = 12347;
   }
 
   if (FLAG_stress_compaction) {
     FLAG_force_marking_deque_overflows = true;
     FLAG_gc_global = true;
     FLAG_max_new_space_size = (1 << (kPageSizeBits - 10)) * 2;
@@ skipping 30 matching lines @@
   platform_ = NULL;
 }
 
 
 v8::Platform* V8::GetCurrentPlatform() {
   ASSERT(platform_);
   return platform_;
 }
 
 } }  // namespace v8::internal