Introduce IncrementLoadEventDelayCount::clearAndCheckLoadEvent()

third_party/WebKit/Source/core/dom/IncrementLoadEventDelayCount.h

Index: third_party/WebKit/Source/core/dom/IncrementLoadEventDelayCount.h
diff --git a/third_party/WebKit/Source/core/dom/IncrementLoadEventDelayCount.h b/third_party/WebKit/Source/core/dom/IncrementLoadEventDelayCount.h
index c1256148b5eb9e3d1e7b562b6e62d12cf34f921a..23f9eb03830067a7451faa788016617e577a5a6c 100644
--- a/third_party/WebKit/Source/core/dom/IncrementLoadEventDelayCount.h
+++ b/third_party/WebKit/Source/core/dom/IncrementLoadEventDelayCount.h
@@ -24,6 +24,13 @@ class IncrementLoadEventDelayCount {
   static std::unique_ptr<IncrementLoadEventDelayCount> create(Document&);
   ~IncrementLoadEventDelayCount();
 
+  // Decrements the loadEventDelayCount and checks load event synchronously,
+  // and thus can cause synchronous Document load event/JavaScript execution.
+  // Call this only when it is safe, e.g. at the top of an async task.
+  // After calling this, |this| no longer blocks document's load event and
+  // will not decrement loadEventDelayCount at destruction.
+  void clearAndCheckLoadEvent();
+
   // Increments the new document's count and decrements the old count.
   void documentChanged(Document& newDocument);