Linux: use other fonts when the primary is missing glyphs

webkit/port/platform/graphics/chromium/GlyphPageTreeNodeLinux.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
@@ skipping 45 matching lines @@
     uint16_t* glyphs = glyphStorage.get();
     // textToGlyphs takes a byte count, not a glyph count so we multiply by two.
     unsigned count = paint.textToGlyphs(buffer, bufferLength * 2, glyphs);
     if (count != length) {
         SkDebugf("%s count != length\n", __FUNCTION__);
         return false;
     }
 
     unsigned allGlyphs = 0; // track if any of the glyphIDs are non-zero
     for (unsigned i = 0; i < length; i++) {
-        setGlyphDataForIndex(offset + i, glyphs[i], fontData);
+        setGlyphDataForIndex(offset + i, glyphs[i], glyphs[i] ? fontData : NULL);
         allGlyphs |= glyphs[i];
     }
     return allGlyphs != 0;
 }
 
 }  // namespace WebCore