From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Samuel Attard <marshallofsound@electronjs.org>
Date: Thu, 9 Mar 2023 01:28:56 -0800
Subject: feat: expose DocumentLoader::SetDefersLoading on WebDocumentLoader

This allows embedders to call SetDefersLoading without reaching into Blink internals. Electron uses this to defer page loading until the preload scripts have finished executing.
This might be upstreamable?

diff --git a/third_party/blink/public/web/web_document_loader.h b/third_party/blink/public/web/web_document_loader.h
index 23b29fe25bc463ff1d36aa502a27c4222595e7c5..c1ac6172c4cee72f64f42ca64d2db9c0f1f48738 100644
--- a/third_party/blink/public/web/web_document_loader.h
+++ b/third_party/blink/public/web/web_document_loader.h
@@ -38,6 +38,7 @@
 #include "third_party/blink/public/platform/cross_variant_mojo_util.h"
 #include "third_party/blink/public/platform/web_archive_info.h"
 #include "third_party/blink/public/platform/web_common.h"
+#include "third_party/blink/public/platform/web_loader_freeze_mode.h"
 #include "third_party/blink/public/platform/web_source_location.h"
 #include "third_party/blink/public/web/web_navigation_type.h"
 
@@ -63,6 +64,8 @@ class BLINK_EXPORT WebDocumentLoader {
     virtual std::unique_ptr<ExtraData> Clone() = 0;
   };
 
+  virtual void SetDefersLoading(WebLoaderFreezeMode) = 0;
+
   static bool WillLoadUrlAsEmpty(const WebURL&);
 
   // Returns the http referrer of original request which initited this load.
diff --git a/third_party/blink/renderer/core/loader/document_loader.h b/third_party/blink/renderer/core/loader/document_loader.h
index aa2e582b43a0ca9cad9c1e62c5887ff3f699b86a..1b514b8d881a8feee2426dd0557b3354c63f4417 100644
--- a/third_party/blink/renderer/core/loader/document_loader.h
+++ b/third_party/blink/renderer/core/loader/document_loader.h
@@ -324,7 +324,7 @@ class CORE_EXPORT DocumentLoader : public GarbageCollected<DocumentLoader>,
       std::optional<scheduler::TaskAttributionId>
           soft_navigation_heuristics_task_id);
 
-  void SetDefersLoading(LoaderFreezeMode);
+  void SetDefersLoading(LoaderFreezeMode) override;
 
   DocumentLoadTiming& GetTiming() { return document_load_timing_; }