Move FontConfig factory into separate file.

include/ports/SkFontMgr_fontconfig.h

Index: include/ports/SkFontMgr_fontconfig.h
diff --git a/include/ports/SkFontMgr_fontconfig.h b/include/ports/SkFontMgr_fontconfig.h
new file mode 100644
index 0000000000000000000000000000000000000000..7a59ff0c469e7ceeb5266f905ed6f68febd9d944
--- /dev/null
+++ b/include/ports/SkFontMgr_fontconfig.h
@@ -0,0 +1,22 @@
+/*
+ * Copyright 2015 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#ifndef SkFontMgr_fontconfig_DEFINED
+#define SkFontMgr_fontconfig_DEFINED
+
+#include "SkTypes.h"
+#include <fontconfig/fontconfig.h>
+
+class SkFontMgr;
+
+/** Create a font manager around a FontConfig instance.
+ *  If 'fc' is NULL, will use a new default config.
+ *  Takes ownership of 'fc' and will call FcConfigDestroy on it.
+ */
+SK_API SkFontMgr* SkFontMgr_New_FontConfig(FcConfig* fc);
+
+#endif // #ifndef SkFontMgr_fontconfig_DEFINED