Ensure default isolate is present in Context::New().

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 4269 matching lines @@
   }
   return i::Handle<i::FunctionTemplateInfo>(
     i::FunctionTemplateInfo::cast(templ->constructor()));
 }
 
 
 Persistent<Context> v8::Context::New(
     v8::ExtensionConfiguration* extensions,
     v8::Handle<ObjectTemplate> global_template,
     v8::Handle<Value> global_object) {
+  i::Isolate::EnsureDefaultIsolate();
   i::Isolate* isolate = i::Isolate::Current();
   EnsureInitializedForIsolate(isolate, "v8::Context::New()");
   LOG_API(isolate, "Context::New");
   ON_BAILOUT(isolate, "v8::Context::New()", return Persistent<Context>());
 
   // Enter V8 via an ENTER_V8 scope.
   i::Handle<i::Context> env;
   {
     ENTER_V8(isolate);
     v8::Handle<ObjectTemplate> proxy_template = global_template;
@@ skipping 2076 matching lines @@
 
 
 char* HandleScopeImplementer::Iterate(ObjectVisitor* v, char* storage) {
   HandleScopeImplementer* scope_implementer =
       reinterpret_cast<HandleScopeImplementer*>(storage);
   scope_implementer->IterateThis(v);
   return storage + ArchiveSpacePerThread();
 }
 
 } }  // namespace v8::internal