Move FontConfig factory into separate file.

src/ports/SkFontMgr_fontconfig.cpp

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkDataTable.h"
 #include "SkFontDescriptor.h"
 #include "SkFontHost_FreeType_common.h"
@@ skipping 572 matching lines @@
             FcPatternReference(pattern);
             face = SkTypeface_fontconfig::Create(pattern);
             if (face) {
                 fTFCache.add(face, SkFontStyle());
             }
         }
         return face;
     }
 
 public:
-    SkFontMgr_fontconfig()
-        : fFC(FcInitLoadConfigAndFonts())
-        , fFamilyNames(GetFamilyNames(fFC)) { }
-
     /** Takes control of the reference to 'config'. */
     explicit SkFontMgr_fontconfig(FcConfig* config)
-        : fFC(config)
+        : fFC(config ? config : FcInitLoadConfigAndFonts())
         , fFamilyNames(GetFamilyNames(fFC)) { }
 
     virtual ~SkFontMgr_fontconfig() {
         // Hold the lock while unrefing the config.
         FCLocker lock;
         fFC.reset();
     }
 
 protected:
     int onCountFamilies() const override {
@@ skipping 256 matching lines @@
                                                : SkFontStyle::kUpright_Slant);
         SkAutoTUnref<SkTypeface> typeface(this->matchFamilyStyle(familyName, style));
         if (typeface.get()) {
             return typeface.detach();
         }
 
         return this->matchFamilyStyle(NULL, style);
     }
 };
 
-SkFontMgr* SkFontMgr::Factory() {
-    return SkNEW(SkFontMgr_fontconfig);
+SK_API SkFontMgr* SkFontMgr_New_FontConfig(FcConfig* fc) {
+    return new SkFontMgr_fontconfig(fc);
 }