Add m_isGlyphLookupMode to UniscribeHelper class and set it to true when fill...

third_party/WebKit/WebCore/platform/graphics/chromium/UniscribeHelper.h

 // Copyright (c) 2006-2008, Google Inc. All rights reserved.
 // 
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 // 
 //     * Redistributions of source code must retain the above copyright
 // notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 // copyright notice, this list of conditions and the following disclaimer
@@ skipping 125 matching lines @@
     void setWordSpacing(int wordSpacing)
     {
         m_wordSpacing = wordSpacing;
     }
 
     void setAscent(int ascent)
     {
         m_ascent = ascent;
     }
 
+    // When set to true, this class is used only to look up glyph
+    // indices for a range of Unicode characters without glyph placement.
+    // By default, it's false. This should be set to true when this
+    // class is used for glyph index look-up for non-BMP characters
+    // in GlyphPageNodeChromiumWin.cpp.
+    void setDisableFontFallback(bool disableFontFallback)
+    {
+        m_disableFontFallback = true;
+    }
+
     // You must call this after setting any options but before doing any
     // other calls like asking for widths or drawing.
     void Init()
     {
         InitWithOptionalLengthProtection(true);
     }
 
     // Returns the total width in pixels of the text run.
     int Width() const;
 
@@ skipping 219 matching lines @@
     int m_ascent;
     LOGFONT m_logfont;
     int m_style;
 
     // Options, see the getters/setters above.
     bool m_directionalOverride;
     bool m_inhibitLigate;
     int m_letterSpacing;
     int m_spaceWidth;
     int m_wordSpacing;
+    bool m_disableFontFallback;
 
     // Uniscribe breaks the text into Runs. These are one length of text that is
     // in one script and one direction. This array is in reading order.
     Vector<SCRIPT_ITEM, UNISCRIBE_HELPER_STACK_RUNS> m_runs;
 
     Vector<Shaping, UNISCRIBE_HELPER_STACK_RUNS> m_shapes;
 
     // This is a mapping between reading order and screen order for the items.
     // Uniscribe's items array are in reading order. For right-to-left text,
     // or mixed (although WebKit's |TextRun| should really be only one
     // direction), this makes it very difficult to compute character offsets
     // and positions. This list is in screen order from left to right, and
     // gives the index into the |m_runs| and |m_shapes| arrays of each
     // subsequent item.
     Vector<int, UNISCRIBE_HELPER_STACK_RUNS> m_screenOrder;
 };
 
 }  // namespace WebCore
 
 #endif  // UniscribeHelper_h