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

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

Index: third_party/WebKit/Source/bindings/core/v8/LocalWindowProxy.cpp
diff --git a/third_party/WebKit/Source/bindings/core/v8/LocalWindowProxy.cpp b/third_party/WebKit/Source/bindings/core/v8/LocalWindowProxy.cpp
index d8c2cd101c1a4d38de65d939beee3e7c39063e5d..c4b5c9496557bccbdbfff4164953bd2e63811fdc 100644
--- a/third_party/WebKit/Source/bindings/core/v8/LocalWindowProxy.cpp
+++ b/third_party/WebKit/Source/bindings/core/v8/LocalWindowProxy.cpp
@@ -93,7 +93,7 @@ void LocalWindowProxy::DisposeContext(Lifecycle next_status) {
     V8DOMWrapper::ClearNativeInfo(GetIsolate(), context->Global());
     script_state_->DetachGlobalObject();
 
-#if DCHECK_IS_ON()
+#if DCHECK_IS_ON() || DVLOG_IS_ON()
     DidDetachGlobalObject();
 #endif
   }
@@ -200,7 +200,7 @@ void LocalWindowProxy::CreateContext() {
   }
   CHECK(!context.IsEmpty());
 
-#if DCHECK_IS_ON()
+#if DCHECK_IS_ON() || DVLOG_IS_ON()
   DidAttachGlobalObject();
 #endif