add dummpy SkFontMgr::Factory() impl to font backends, so we can start testing it

trunk/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 "SkFontDescriptor.h"
 #include "SkFontHost.h"
@@ skipping 204 matching lines @@
                 ? SkFontStream::GetTableData(stream, ttcIndex,
                                              tag, offset, length, data)
                 : 0;
 }
 
 void FontConfigTypeface::onGetFontDescriptor(SkFontDescriptor* desc,
                                              bool* isLocalStream) const {
     desc->setFamilyName(this->getFamilyName());
     *isLocalStream = SkToBool(this->getLocalStream());
 }
+
+///////////////////////////////////////////////////////////////////////////////
+
+#include "SkFontMgr.h"
+
+SkFontMgr* SkFontMgr::Factory() {
+    // todo
+    return NULL;
+}