Add fallback fonts for math and symbol blocks on Windows

Source/platform/fonts/win/FontFallbackWin.cpp

 /*
  * Copyright (c) 2006, 2007, 2008, 2009, 2010, 2012 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 279 matching lines @@
     // If script is invalid, common or inherited or there's an error,
     // infer a script based on the unicode block of a character.
     if (script <= USCRIPT_INHERITED || U_FAILURE(err))
         script = getScriptBasedOnUnicodeBlock(ucs4);
     return script;
 }
 
 const UChar* getFontBasedOnUnicodeBlock(int ucs4, SkFontMgr* fontManager)
 {
     static const UChar* emojiFonts[] = {L"Segoe UI Emoji", L"Segoe UI Symbol"};
+    static const UChar* mathFonts[] = {L"Cambria Math", L"Segoe UI Symbol", L"Code2000"};
     static const UChar* symbolFont = L"Segoe UI Symbol";
     static const UChar* emojiFont = 0;
+    static const UChar* mathFont = 0;
     static bool initialized = false;
     if (!initialized) {
         for (size_t i = 0; i < WTF_ARRAY_LENGTH(emojiFonts); i++) {
             if (isFontPresent(emojiFonts[i], fontManager)) {
                 emojiFont = emojiFonts[i];
                 break;
             }
         }
+        for (size_t i = 0; i < WTF_ARRAY_LENGTH(mathFonts); i++) {
+            if (isFontPresent(mathFonts[i], fontManager)) {
+                mathFont = mathFonts[i];
+                break;
+            }
+        }
         initialized = true;
     }
 
     UBlockCode block = ublock_getCode(ucs4);
     switch (block) {
     case UBLOCK_EMOTICONS:
+    case UBLOCK_ENCLOSED_ALPHANUMERIC_SUPPLEMENT:
         return emojiFont;
     case UBLOCK_PLAYING_CARDS:
     case UBLOCK_MISCELLANEOUS_SYMBOLS:
+    case UBLOCK_MISCELLANEOUS_SYMBOLS_AND_ARROWS:
     case UBLOCK_MISCELLANEOUS_SYMBOLS_AND_PICTOGRAPHS:
-    case UBLOCK_MISCELLANEOUS_TECHNICAL:
     case UBLOCK_TRANSPORT_AND_MAP_SYMBOLS:
     case UBLOCK_ALCHEMICAL_SYMBOLS:
     case UBLOCK_RUNIC:
+    case UBLOCK_DINGBATS:
+    case UBLOCK_GOTHIC:
+        return symbolFont;
+    case UBLOCK_ARROWS:
+    case UBLOCK_MATHEMATICAL_OPERATORS:
+    case UBLOCK_MISCELLANEOUS_TECHNICAL:
+    case UBLOCK_GEOMETRIC_SHAPES:
+    case UBLOCK_MISCELLANEOUS_MATHEMATICAL_SYMBOLS_A:
+    case UBLOCK_SUPPLEMENTAL_ARROWS_A:
+    case UBLOCK_SUPPLEMENTAL_ARROWS_B:
+    case UBLOCK_MISCELLANEOUS_MATHEMATICAL_SYMBOLS_B:
     case UBLOCK_SUPPLEMENTAL_MATHEMATICAL_OPERATORS:
-    case UBLOCK_DINGBATS:
-        return symbolFont;
+    case UBLOCK_MATHEMATICAL_ALPHANUMERIC_SYMBOLS:
+    case UBLOCK_ARABIC_MATHEMATICAL_ALPHABETIC_SYMBOLS:
+    case UBLOCK_GEOMETRIC_SHAPES_EXTENDED:
+        return mathFont;
     default:
         return 0;
     };
 }
 
 } // namespace
 
 // FIXME: this is font fallback code version 0.1
 //  - Cover all the scripts
 //  - Get the default font for each script/generic family from the
@@ skipping 86 matching lines @@
             family = L"lucida sans unicode";
         }
     }
 
     if (scriptChecked)
         *scriptChecked = script;
     return family;
 }
 
 } // namespace blink