Defer loads in new pages/frames if ScopedPageLoadDeferral is active

third_party/WebKit/Source/core/loader/FrameLoader.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) 2008 Alp Toker <alp@atoker.com>
  * Copyright (C) Research In Motion Limited 2009. All rights reserved.
  * Copyright (C) 2011 Kris Jordan <krisjordan@gmail.com>
  * Copyright (C) 2011 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
@@ skipping 186 matching lines @@
 
 void FrameLoader::init()
 {
     ResourceRequest initialRequest(KURL(ParsedURLString, emptyString()));
     initialRequest.setRequestContext(WebURLRequest::RequestContextInternal);
     initialRequest.setFrameType(m_frame->isMainFrame() ? WebURLRequest::FrameTypeTopLevel : WebURLRequest::FrameTypeNested);
     m_provisionalDocumentLoader = client()->createDocumentLoader(m_frame, initialRequest, SubstituteData());
     m_provisionalDocumentLoader->startLoadingMainResource();
     m_frame->document()->cancelParsing();
     m_stateMachine.advanceTo(FrameLoaderStateMachine::DisplayingInitialEmptyDocument);
+    // Self-suspend if created in an already deferred Page. Note that both
+    // startLoadingMainResource() and cancelParsing() may have already detached
+    // the frame, since they both fire JS events.
+    if (m_frame->page() && m_frame->page()->defersLoading())

[Nate Chapin, 2016/07/27 17:30:47]

This makes me saddest of all :(

[dcheng, 2016/07/28 01:23:28]

Yes... I would have to completely agree =(

+        setDefersLoading(true);
     takeObjectSnapshot();
 }
 
 FrameLoaderClient* FrameLoader::client() const
 {
     return static_cast<FrameLoaderClient*>(m_frame->client());
 }
 
 void FrameLoader::setDefersLoading(bool defers)
 {
@@ skipping 1393 matching lines @@
     tracedValue->setString("documentLoaderURL", m_documentLoader ? m_documentLoader->url() : String());
     return tracedValue;
 }
 
 inline void FrameLoader::takeObjectSnapshot() const
 {
     TRACE_EVENT_OBJECT_SNAPSHOT_WITH_ID("loading", "FrameLoader", this, toTracedValue());
 }
 
 } // namespace blink