Rendering text to a canvas in a frame-less document.

third_party/WebKit/Source/core/css/resolver/FontBuilder.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2013 Google Inc. All rights reserved.
  * Copyright (C) 2015 Collabora Ltd. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
@@ skipping 20 matching lines @@
 #include "core/style/ComputedStyle.h"
 #include "platform/FontFamilyNames.h"
 #include "platform/fonts/FontDescription.h"
 
 namespace blink {
 
 FontBuilder::FontBuilder(const Document& document)
     : m_document(&document)
     , m_flags(0)
 {
-    ASSERT(document.frame());
 }
 
 void FontBuilder::setInitial(float effectiveZoom)
 {
     ASSERT(m_document->settings());
     if (!m_document->settings())
         return;
 
     setFamilyDescription(m_fontDescription, FontBuilder::initialFamilyDescription());
     setSize(m_fontDescription, FontBuilder::initialSize());
@@ skipping 353 matching lines @@
     setSize(fontDescription, FontDescription::Size(FontSize::initialKeywordSize(), 0.0f, false));
     updateSpecifiedSize(fontDescription, documentStyle);
     updateComputedSize(fontDescription, documentStyle);
 
     updateOrientation(fontDescription, documentStyle);
     documentStyle.setFontDescription(fontDescription);
     documentStyle.font().update(fontSelector);
 }
 
 } // namespace blink