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 ff1948e649fffdc92a2db0e736c99bf4e8c06514..b165201b273c8fa9de8e66fe8ef7bfc28eee0850 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"
 
@@ -62,6 +63,8 @@ class BLINK_EXPORT WebDocumentLoader {
     virtual ~ExtraData() = default;
   };
 
+  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 1548bbee1845eaac75ceb9e2b2783b69084956e4..c9e8293ef2d662210cb9fc95488c6a51ffc80df8 100644
--- a/third_party/blink/renderer/core/loader/document_loader.h
+++ b/third_party/blink/renderer/core/loader/document_loader.h
@@ -305,7 +305,7 @@ class CORE_EXPORT DocumentLoader : public GarbageCollected<DocumentLoader>,
       absl::optional<scheduler::TaskAttributionId>
           soft_navigation_heuristics_task_id);
 
-  void SetDefersLoading(LoaderFreezeMode);
+  void SetDefersLoading(LoaderFreezeMode) override;
 
   DocumentLoadTiming& GetTiming() { return document_load_timing_; }