Add DVLOG_IS_ON() in preparation for adding dvlog_always_on in chromium project.

third_party/WebKit/Source/bindings/core/v8/LocalWindowProxy.cpp

 /*
  * Copyright (C) 2008, 2009, 2011 Google Inc. 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
@@ skipping 75 matching lines @@
     if (!global_proxy_.IsEmpty()) {
       CHECK(global_proxy_ == context->Global());
       CHECK_EQ(ToScriptWrappable(context->Global()),
                ToScriptWrappable(
                    context->Global()->GetPrototype().As<v8::Object>()));
       global_proxy_.Get().SetWrapperClassId(0);
     }
     V8DOMWrapper::ClearNativeInfo(GetIsolate(), context->Global());
     script_state_->DetachGlobalObject();
 
-#if DCHECK_IS_ON()
+#if DCHECK_IS_ON() || DVLOG_IS_ON()
     DidDetachGlobalObject();
 #endif
   }
 
   script_state_->DisposePerContextData();
 
   // It's likely that disposing the context has created a lot of
   // garbage. Notify V8 about this so it'll have a chance of cleaning
   // it up when idle.
   V8GCForContextDispose::Instance().NotifyContextDisposed(
@@ skipping 86 matching lines @@
   v8::Local<v8::Context> context;
   {
     V8PerIsolateData::UseCounterDisabledScope use_counter_disabled(
         V8PerIsolateData::From(GetIsolate()));
     context =
         v8::Context::New(GetIsolate(), &extension_configuration,
                          global_template, global_proxy_.NewLocal(GetIsolate()));
   }
   CHECK(!context.IsEmpty());
 
-#if DCHECK_IS_ON()
+#if DCHECK_IS_ON() || DVLOG_IS_ON()
   DidAttachGlobalObject();
 #endif
 
   script_state_ = ScriptState::Create(context, world_);
 
   DCHECK(lifecycle_ == Lifecycle::kContextIsUninitialized ||
          lifecycle_ == Lifecycle::kGlobalObjectIsDetached);
   lifecycle_ = Lifecycle::kContextIsInitialized;
   DCHECK(script_state_->ContextIsValid());
 }
@@ skipping 254 matching lines @@
 
   SetSecurityToken(origin);
 }
 
 LocalWindowProxy::LocalWindowProxy(v8::Isolate* isolate,
                                    LocalFrame& frame,
                                    RefPtr<DOMWrapperWorld> world)
     : WindowProxy(isolate, frame, std::move(world)) {}
 
 }  // namespace blink