Removed a bunch of GetExistingThreadLocal calls by threading the Isolate.

src/api.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 887 matching lines @@
     result = *value;
   }
   is_closed_ = true;
   Leave();
 
   if (value == NULL) {
     return NULL;
   }
 
   // Allocate a new handle on the previous handle block.
-  i::Handle<i::Object> handle(result);
+  i::Handle<i::Object> handle(result, isolate_);
   return handle.location();
 }
 
 
 // --- N e a n d e r ---
 
 
 // A constructor cannot easily return an error value, therefore it is necessary
 // to check for a dead VM with ON_BAILOUT before constructing any Neander
 // objects.  To remind you about this there is no HandleScope in the
@@ skipping 2488 matching lines @@
 
 
 v8::Local<v8::Value> v8::Object::GetHiddenValue(v8::Handle<v8::String> key) {
   i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
   ON_BAILOUT(isolate, "v8::Object::GetHiddenValue()",
              return Local<v8::Value>());
   ENTER_V8(isolate);
   i::Handle<i::JSObject> self = Utils::OpenHandle(this);
   i::Handle<i::String> key_obj = Utils::OpenHandle(*key);
   i::Handle<i::String> key_symbol = FACTORY->LookupSymbol(key_obj);
-  i::Handle<i::Object> result(self->GetHiddenProperty(*key_symbol));
+  i::Handle<i::Object> result(self->GetHiddenProperty(*key_symbol), isolate);
   if (result->IsUndefined()) return v8::Local<v8::Value>();
   return Utils::ToLocal(result);
 }
 
 
 bool v8::Object::DeleteHiddenValue(v8::Handle<v8::String> key) {
   i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
   ON_BAILOUT(isolate, "v8::DeleteHiddenValue()", return false);
   ENTER_V8(isolate);
   i::HandleScope scope(isolate);
@@ skipping 1214 matching lines @@
   }
   i::Handle<i::Object> calling =
       isolate->GetCallingNativeContext();
   if (calling.is_null()) return Local<Context>();
   i::Handle<i::Context> context = i::Handle<i::Context>::cast(calling);
   return Utils::ToLocal(context);
 }
 
 
 v8::Local<v8::Object> Context::Global() {
-  if (IsDeadCheck(i::Isolate::Current(), "v8::Context::Global()")) {
+  i::Isolate* isolate = i::Isolate::Current();
+  if (IsDeadCheck(isolate, "v8::Context::Global()")) {
     return Local<v8::Object>();
   }
   i::Object** ctx = reinterpret_cast<i::Object**>(this);
   i::Handle<i::Context> context =
       i::Handle<i::Context>::cast(i::Handle<i::Object>(ctx));
-  i::Handle<i::Object> global(context->global_proxy());
+  i::Handle<i::Object> global(context->global_proxy(), isolate);
   return Utils::ToLocal(i::Handle<i::JSObject>::cast(global));
 }
 
 
 void Context::DetachGlobal() {
   i::Isolate* isolate = i::Isolate::Current();
   if (IsDeadCheck(isolate, "v8::Context::DetachGlobal()")) return;
   ENTER_V8(isolate);
   i::Object** ctx = reinterpret_cast<i::Object**>(this);
   i::Handle<i::Context> context =
@@ skipping 1995 matching lines @@
 
   v->VisitPointers(blocks_.first(), first_block_limit_);
 
   for (int i = 1; i < blocks_.length(); i++) {
     v->VisitPointers(blocks_[i], &blocks_[i][kHandleBlockSize]);
   }
 }
 
 
 } }  // namespace v8::internal