call portable font cleanup only once at app end

tools/sk_tool_utils.h

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef sk_tool_utils_DEFINED
 #define sk_tool_utils_DEFINED
 
@@ skipping 18 matching lines @@
     /**
      * Sets the paint to use a platform-independent text renderer if FLAGS_portableFonts is set.
      * FIXME: will become obsolete as GMs migrate to set portable typeface always.
      */
     void set_portable_typeface(SkPaint* paint, const char* name = NULL,
                                SkTypeface::Style style = SkTypeface::kNormal);
     void set_portable_typeface_always(SkPaint* paint, const char* name = NULL,
                                SkTypeface::Style style = SkTypeface::kNormal);
     SkTypeface* create_portable_typeface(const char* name, SkTypeface::Style style);
     SkTypeface* create_portable_typeface_always(const char* name, SkTypeface::Style style);
+    /** Call to clean up portable font references. */
+    void release_portable_typefaces();
     void report_used_chars();
 
     /**
      *  Call canvas->writePixels() by using the pixels from bitmap, but with an info that claims
      *  the pixels are colorType + alphaType
      */
     void write_pixels(SkCanvas*, const SkBitmap&, int x, int y, SkColorType, SkAlphaType);
 
     // private to sk_tool_utils
     SkTypeface* create_font(const char* name, SkTypeface::Style );
@@ skipping 26 matching lines @@
         }
     };
 
     // A helper for inserting a drawtext call into a SkTextBlobBuilder
     void add_to_text_blob(SkTextBlobBuilder* builder, const char* text, const SkPaint& origPaint,
                           SkScalar x, SkScalar y);
 
 }  // namespace sk_tool_utils
 
 #endif  // sk_tool_utils_DEFINED