Add Settings::deviceScaleAdjustment.

Source/core/page/Settings.h

 /*
  * Copyright (C) 2003, 2006, 2007, 2008, 2009, 2011, 2012 Apple Inc. All rights reserved.
  *           (C) 2006 Graham Dennis (graham.dennis@gmail.com)
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 73 matching lines @@
 
     void setPictographFontFamily(const AtomicString&, UScriptCode = USCRIPT_COMMON);
     const AtomicString& pictographFontFamily(UScriptCode = USCRIPT_COMMON) const;
 
     void setTextAutosizingEnabled(bool);
     bool textAutosizingEnabled() const;
 
     void setTextAutosizingFontScaleFactor(float);
     float textAutosizingFontScaleFactor() const { return m_textAutosizingFontScaleFactor; }
 
+    // Compensates for poor text legibility on mobile devices. This value is
+    // multiplied by the font scale factor when performing text autosizing of
+    // websites that do not set an explicit viewport description.
+    void setDeviceScaleAdjustment(float);
+    float deviceScaleAdjustment() const { return m_deviceScaleAdjustment; }
+
     // Only set by Layout Tests, and only used if textAutosizingEnabled() returns true.
     void setTextAutosizingWindowSizeOverride(const IntSize&);
     const IntSize& textAutosizingWindowSizeOverride() const { return m_textAutosizingWindowSizeOverride; }
 
     void setUseWideViewport(bool);
     bool useWideViewport() const { return m_useWideViewport; }
 
     void setLoadWithOverviewMode(bool);
     bool loadWithOverviewMode() const { return m_loadWithOverviewMode; }
 
@@ skipping 57 matching lines @@
     String m_mediaTypeOverride;
     KURL m_userStyleSheetLocation;
     ScriptFontFamilyMap m_standardFontFamilyMap;
     ScriptFontFamilyMap m_serifFontFamilyMap;
     ScriptFontFamilyMap m_fixedFontFamilyMap;
     ScriptFontFamilyMap m_sansSerifFontFamilyMap;
     ScriptFontFamilyMap m_cursiveFontFamilyMap;
     ScriptFontFamilyMap m_fantasyFontFamilyMap;
     ScriptFontFamilyMap m_pictographFontFamilyMap;
     float m_textAutosizingFontScaleFactor;
+    float m_deviceScaleAdjustment;
     IntSize m_textAutosizingWindowSizeOverride;
     bool m_textAutosizingEnabled : 1;
     bool m_useWideViewport : 1;
     bool m_loadWithOverviewMode : 1;
 
     SETTINGS_MEMBER_VARIABLES
 
     bool m_isJavaEnabled : 1;
     bool m_loadsImagesAutomatically : 1;
     bool m_areImagesEnabled : 1;
     bool m_arePluginsEnabled : 1;
     bool m_isScriptEnabled : 1;
     bool m_dnsPrefetchingEnabled : 1;
 
     bool m_touchEventEmulationEnabled : 1;
     bool m_openGLMultisamplingEnabled : 1;
     bool m_viewportEnabled : 1;
 
     // FIXME: This is a temporary flag and should be removed once accelerated
     // overflow scroll is ready (crbug.com/254111).
     bool m_compositorDrivenAcceleratedScrollingEnabled : 1;
 
     Timer<Settings> m_setImageLoadingSettingsTimer;
     void imageLoadingSettingsTimerFired(Timer<Settings>*);
+    void recalculateTextAutosizingMultipliers();
 };
 
 } // namespace WebCore
 
 #endif // Settings_h