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

third_party/WebKit/WebCore/platform/graphics/chromium/GlyphPageTreeNodeChromiumWin.cpp

 // Copyright (c) 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 186 matching lines @@
                              GlyphPage* page,
                              const SimpleFontData* fontData)
 {
     bool haveGlyphs = false;
 
     UniscribeHelperTextRun state(buffer, length * 2, false,
                                  fontData->m_font.hfont(),
                                  fontData->m_font.scriptCache(),
                                  fontData->m_font.scriptFontProperties());
     state.setInhibitLigate(true);
+    state.setDisableFontFallback(true);
     state.Init();
 
     for (unsigned i = 0; i < length; i++) {
         // Each character in this input buffer is a surrogate pair, which
         // consists of two UChars. So, the offset for its i-th character is
         // (i * 2).
         WORD glyph = state.FirstGlyphForCharacter(i * 2);
         if (glyph) {
             haveGlyphs = true;
             page->setGlyphDataForIndex(offset + i, glyph, fontData);
@@ skipping 23 matching lines @@
         // because each character in the non-BMP input buffer will be 
         // represented by a surrogate pair (two UChar's).
         return fillNonBMPGlyphs(offset, length, characterBuffer,
                                 this, fontData);
     }
     ASSERT_NOT_REACHED();
     return false;
 }
 
 }  // namespace WebCore