fix fontconfig backend to only cache new fonts if their outName was unique

src/ports/SkFontHost_fontconfig.cpp

 /*
  * Copyright 2008 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkFontConfigInterface.h"
 #include "SkFontConfigTypeface.h"
 #include "SkFontDescriptor.h"
@@ skipping 91 matching lines @@
 
     SkFontConfigInterface::FontIdentity indentity;
     SkString                            outFamilyName;
     SkTypeface::Style                   outStyle;
 
     if (!fci->matchFamilyName(familyName, style,
                               &indentity, &outFamilyName, &outStyle)) {
         return NULL;
     }
 
+    // check if we, in fact, already have this. perhaps fontconfig aliased the
+    // requested name to some other name we actually have...
+    rec.fFamilyName = outFamilyName.c_str();
+    rec.fStyle = outStyle;
+    face = SkTypefaceCache::FindByProcAndRef(find_proc, &rec);
+    if (face) {
+        return face;
+    }
+
     face = SkNEW_ARGS(FontConfigTypeface, (outStyle, indentity, outFamilyName));
     SkTypefaceCache::Add(face, style);
 //    SkDebugf("add face <%s> <%s> %p [%d]\n", familyName, outFamilyName.c_str(), face, face->getRefCnt());
     return face;
 }
 
 #ifndef SK_FONTHOST_USES_FONTMGR
 
 SkTypeface* SkFontHost::CreateTypeface(const SkTypeface* familyFace,
                                        const char familyName[],
@@ skipping 76 matching lines @@
 
 void FontConfigTypeface::onGetFontDescriptor(SkFontDescriptor* desc,
                                              bool* isLocalStream) const {
     desc->setFamilyName(this->getFamilyName());
     *isLocalStream = SkToBool(this->getLocalStream());
 }
 
 SkTypeface* FontConfigTypeface::onRefMatchingStyle(Style style) const {
     return LegacyCreateTypeface(this, NULL, style);
 }