Implement font-family: initial.

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.
  *
  * 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 62 matching lines @@
     // All documents need to be in a frame (and thus have access to Settings)
     // for style-resolution to make sense.
     // Unfortunately SVG Animations currently violate this: crbug.com/260966
     // ASSERT(m_document->frame());
     m_document = &document;
     m_useSVGZoomRules = useSVGZoomRules;
     m_style = style;
     m_fontDirty = false;
 }
 
+inline static void setFontFamilyToStandard(FontDescription& fontDescription, const Document* document)
+{
+    if (!document || !document->settings())
+        return;
+
+    fontDescription.setGenericFamily(FontDescription::StandardFamily);
+    const AtomicString& standardFontFamily = document->settings()->genericFontFamilySettings().standard();
+    if (standardFontFamily.isEmpty())
+        return;
+
+    fontDescription.firstFamily().setFamily(standardFontFamily);
+    // FIXME: Why is this needed here?
+    fontDescription.firstFamily().appendFamily(nullptr);
+}
+
 void FontBuilder::setInitial(float effectiveZoom)
 {
     ASSERT(m_document && m_document->settings());
     if (!m_document || !m_document->settings())
         return;
 
     FontDescriptionChangeScope scope(this);
 
     scope.reset();
-    scope.fontDescription().setGenericFamily(FontDescription::StandardFamily);
     scope.fontDescription().setUsePrinterFont(m_document->printing());
-    const AtomicString& standardFontFamily = m_document->settings()->genericFontFamilySettings().standard();
-    if (!standardFontFamily.isEmpty()) {
-        scope.fontDescription().firstFamily().setFamily(standardFontFamily);
-        scope.fontDescription().firstFamily().appendFamily(nullptr);
-    }
+    setFontFamilyToStandard(scope.fontDescription(), m_document);
     scope.fontDescription().setKeywordSize(CSSValueMedium - CSSValueXxSmall + 1);
     setSize(scope.fontDescription(), effectiveZoom, FontSize::fontSizeForKeyword(m_document, CSSValueMedium, false));
 }
 
 void FontBuilder::inheritFrom(const FontDescription& fontDescription)
 {
     FontDescriptionChangeScope scope(this);
 
     scope.set(fontDescription);
 }
@@ skipping 23 matching lines @@
 
     // Handle the zoom factor.
     fontDescription.setComputedSize(getComputedSizeFromSpecifiedSize(fontDescription, effectiveZoom, fontDescription.specifiedSize()));
     scope.set(fontDescription);
 }
 
 void FontBuilder::setFontFamilyInitial()
 {
     FontDescriptionChangeScope scope(this);
 
-    scope.fontDescription().setGenericFamily(FontBuilder::initialGenericFamily());
+    setFontFamilyToStandard(scope.fontDescription(), m_document);
 }
 
 void FontBuilder::setFontFamilyInherit(const FontDescription& parentFontDescription)
 {
     FontDescriptionChangeScope scope(this);
 
     scope.fontDescription().setGenericFamily(parentFontDescription.genericFamily());
     scope.fontDescription().setFamily(parentFontDescription.family());
     scope.fontDescription().setIsSpecifiedFont(parentFontDescription.isSpecifiedFont());
 }
@@ skipping 490 matching lines @@
     checkForGenericFamilyChange(style, parentStyle);
     checkForOrientationChange(style);
     style->font().update(fontSelector);
     m_fontDirty = false;
 }
 
 void FontBuilder::createFontForDocument(PassRefPtr<FontSelector> fontSelector, RenderStyle* documentStyle)
 {
     FontDescription fontDescription = FontDescription();
     fontDescription.setScript(localeToScriptCodeForFontSelection(documentStyle->locale()));
-    if (Settings* settings = m_document->settings()) {
-        fontDescription.setUsePrinterFont(m_document->printing());
-        const AtomicString& standardFont = settings->genericFontFamilySettings().standard(fontDescription.script());
-        if (!standardFont.isEmpty()) {
-            fontDescription.setGenericFamily(FontDescription::StandardFamily);
-            fontDescription.firstFamily().setFamily(standardFont);
-            fontDescription.firstFamily().appendFamily(nullptr);
-        }
-        fontDescription.setKeywordSize(CSSValueMedium - CSSValueXxSmall + 1);
-        int size = FontSize::fontSizeForKeyword(m_document, CSSValueMedium, false);
-        fontDescription.setSpecifiedSize(size);
-        fontDescription.setComputedSize(getComputedSizeFromSpecifiedSize(fontDescription, documentStyle->effectiveZoom(), size));
-    } else {
-        fontDescription.setUsePrinterFont(m_document->printing());
-    }
+    fontDescription.setUsePrinterFont(m_document->printing());
+
+    setFontFamilyToStandard(fontDescription, m_document);
+    fontDescription.setKeywordSize(CSSValueMedium - CSSValueXxSmall + 1);
+    int size = FontSize::fontSizeForKeyword(m_document, CSSValueMedium, false);
+    fontDescription.setSpecifiedSize(size);
+    fontDescription.setComputedSize(getComputedSizeFromSpecifiedSize(fontDescription, documentStyle->effectiveZoom(), size));
 
     FontOrientation fontOrientation;
     NonCJKGlyphOrientation glyphOrientation;
     getFontAndGlyphOrientation(documentStyle, fontOrientation, glyphOrientation);
     fontDescription.setOrientation(fontOrientation);
     fontDescription.setNonCJKGlyphOrientation(glyphOrientation);
     documentStyle->setFontDescription(fontDescription);
     documentStyle->font().update(fontSelector);
 }
 
 }