Pause HTML parser for external stylesheets in the body

third_party/WebKit/Source/core/dom/StyleEngine.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2011, 2012 Apple Inc. All
  * rights reserved.
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved.
  * (http://www.torchmobile.com/)
  * Copyright (C) 2008, 2009, 2011, 2012 Google Inc. All rights reserved.
@@ skipping 143 matching lines @@
   // required by some inspector tests, at least. I theory this should not be
   // necessary. Need to investigate to figure out if/why.
   updateActiveStyle();
   return *m_inspectorStyleSheet;
 }
 
 void StyleEngine::addPendingSheet(StyleEngineContext& context) {
   m_pendingScriptBlockingStylesheets++;
 
   context.addingPendingSheet(document());
-  if (context.addedPendingSheetBeforeBody())
+  if (context.addedPendingSheetBeforeBody()) {
     m_pendingRenderBlockingStylesheets++;
+  } else {
+    m_pendingBodyStylesheets++;
+    document().didAddPendingStylesheetInBody();
+  }
 }
 
 // This method is called whenever a top-level stylesheet has finished loading.
 void StyleEngine::removePendingSheet(Node& styleSheetCandidateNode,
                                      const StyleEngineContext& context) {
   if (styleSheetCandidateNode.isConnected())
     setNeedsActiveStyleUpdate(styleSheetCandidateNode.treeScope());
 
   if (context.addedPendingSheetBeforeBody()) {
     DCHECK_GT(m_pendingRenderBlockingStylesheets, 0);
     m_pendingRenderBlockingStylesheets--;
+  } else {
+    DCHECK_GT(m_pendingBodyStylesheets, 0);
+    m_pendingBodyStylesheets--;
+    if (!m_pendingBodyStylesheets)
+      document().didRemoveAllPendingBodyStylesheets();
   }
 
   // Make sure we knew this sheet was pending, and that our count isn't out of
   // sync.
   DCHECK_GT(m_pendingScriptBlockingStylesheets, 0);
 
   m_pendingScriptBlockingStylesheets--;
   if (m_pendingScriptBlockingStylesheets)
     return;
 
@@ skipping 950 matching lines @@
 }
 
 DEFINE_TRACE_WRAPPERS(StyleEngine) {
   for (auto sheet : m_injectedAuthorStyleSheets) {
     visitor->traceWrappers(sheet);
   }
   visitor->traceWrappers(m_documentStyleSheetCollection);
 }
 
 }  // namespace blink